Questions about MOSLOCK?
Find your answers here.

Effectiveness varies by product. Sufficient sound pressure (sound intensity) is a key condition.

A 2007 Cochrane review found no evidence that the products then on the market reduced mosquito bites. A later 2021 study at Incheon National University reported reduced approach behavior in Aedes aegypti under high-sound-pressure ultrasound in laboratory conditions. Approach and attempts to land on a human hand decreased, with a tendency toward greater repellency at higher sound pressures.

MOSLOCK was developed from this research through three further years of research and testing to identify suitable frequencies and sound pressures.

MOSLOCK product tests also recorded the following results.

• SUV + docking tent (June 25, 2025): blood-feeding counts changed from 20 and 18 with the device OFF to 1 and 0 with it ON—a 97.4% reduction based on the two participants' combined counts.
• SUV interior (August 27–28, 2024): blood-feeding events fell from 20 with the device OFF to 1 with it ON—a 95% reduction.
• Reverberation chamber (November 4–5, 2024): attraction behavior was suppressed in 10 of 12 mosquitoes, corresponding to 83.3%.

Blood-feeding reduction and suppression of attraction are different measures. These figures were measured under specific conditions; actual effectiveness may vary with mosquito species, space size, ventilation and placement.

View original test reports and results →

MOSLOCK is an ultrasonic mosquito repellent designed to reduce mosquitoes' approach toward people by sending high-output ultrasound in several directions through a rotating head.

Five ultrasonic transducers (speakers) emit sound from a head that rotates 360°, using Multi Sweep to continuously change the frequency.

MOSLOCK is designed to address limitations attributed to earlier products: 'low output'and 'limited coverage'using an ultrasonic repellent design.

Developed through three years of testing with Professor Kwon's team at Incheon National University's Research Institute of Vector-Borne Diseases.

MOSLOCK does not kill mosquitoes. It is a repellent designed to reduce their approach using ultrasound.

Actual repellency may vary with mosquito species, environment and placement.

Yes. Mosquitoes detect air vibrations and sound with Johnston's organ at the base of their antennae.

Johnston's organ contains densely packed hearing-related neurons and helps mosquitoes detect cues such as a mate's wingbeats. Detected frequencies and responses differ by species, sex and stimulus conditions.

Responses may vary by mosquito species.

Professor Kwon explains that Culex and Aedes mosquitoes may respond differently because their active times, environments and exoskeletal properties differ.

MOSLOCK builds on research into mosquito responses to ultrasound by Professor Hyung Wook Kwon's team at Incheon National University's Research Institute of Vector-Borne Diseases.

In a 2021 paper in the Journal of Asia-Pacific Entomology, the team reported that high-sound-pressure ultrasound reduced Aedes aegypti approach and attempts to land on human skin, and changed expression of the CO₂-sensing-related gene AaGr3. MOSLOCK was developed through three years of research and tests involving the institute, automotive sound researchers and MARKT.

Earlier studies reported that marketed products did not reduce mosquito bites under actual use conditions.

A 2007 Cochrane review concluded there was no evidence that electronic mosquito repellents reduced bites. Industry explanations such as "mosquitoes avoid bat ultrasound", "they avoid male wingbeat sounds" were also criticized as poorly supported.

In 2021, the Incheon team tested with CO₂ and airflow to more closely resemble host-seeking conditions and observed a significant decrease in mosquito approach under high sound pressure.

No. Results were measured under specified test conditions and can differ in actual use.

Species, mosquito numbers, space size, ventilation, furniture and device placement affect outcomes. Ultrasound travels directionally and weakens with distance or obstructions.

View repellency results and test conditions →

MOSLOCK's ultrasound is above the usual human hearing range, but the device as a whole is not silent.

The head's motor may be audible. For a quiet setting, press the button twice to stop rotation (blue LED). If you are sensitive to high-frequency sound or experience discomfort, move away from the device or stop using it.

Dogs and cats can hear higher frequencies than humans, including part of the ultrasonic range.

Research reports hearing up to about 45 kHz in dogs and 79 kHz in cats. Use caution around pets that respond to ultrasound. If a pet avoids the device or behaves unusually, increase the distance or stop using it.

When using MOSLOCK in a child's room, do not place the ultrasonic output directly against or very close to the ears.

Avoid placing it right beside the face or ears and keep it out of reach. Do not let children dismantle the device or put objects in its connector.

Do not place smartphones or mobile devices immediately beside the operating device. Ultrasound may affect microphones on some devices.

Keep your phone away when making calls, recording or using voice recognition.

No. MOSLOCK is an electronic device that uses ultrasound, not chemical agents.

It leaves no chemical agents or odor in the room and requires no replacement consumables.

Avoid water, moisture, high temperatures and shocks, and use a Korean KC-certified adapter.

• Keep the device dry and do not use it in damp locations.
• Avoid high temperatures, including heaters, direct sun and car interiors in summer.
• Avoid outdoor use during severe thunderstorms and disconnect the adapter.
• If there is unusual noise, a burning smell or smoke, unplug immediately and contact support at +82-2-3487-0700.
• Do not dismantle, modify or repair the device yourself.
• Keep chemicals away and do not insert sharp objects or foreign matter into the connector.

MOSLOCK is designed for an area about 3 m in diameter, based on compact spaces such as bedrooms and cars, and is suited to partially enclosed spaces.

Ultrasound travels directionally and weakens with distance, walls or furniture. Layout matters even at the same floor area; in a large living room, place it near where bites occur, such as a bed or sofa.

Near the head or foot of the bed, without obstructing the front.

Mosquitoes follow exhaled CO₂ and sweat odors and often approach the face and feet. Professor Kwon recommends placement near the head and feet with this behavior in mind.

• Avoid large furniture or bedding between the device and the person
• Consider entry routes such as windows and doors
• Conditions are easier to manage in enclosed spaces such as a bedroom with the door shut
• Do not place the ultrasonic outlet right beside an ear

Yes, preferably in a partially enclosed space such as a tent, a car-camping setup or a docking tent.

MOSLOCK was tested in June 2025 in an SUV connected to a docking tent. Effectiveness may be lower in fully open outdoor spaces or strong wind.

• Keep it inside the tent, protected from rain and dew; do not use it in damp locations.
• Avoid outdoor use during severe thunderstorms.
• Use a power supply supporting at least DC 9 V/2 A, including compatible fast chargers. Bring a PD adapter or power bank that supports this output; ordinary power banks must also support DC 9 V/2 A or higher.

Yes, while the car is occupied or used for car camping. MOSLOCK was tested inside an SUV.

Do not leave the device or adapter in a hot parked car in summer. Operating temperature is −20 °C to 50 °C. Take the device with you when leaving the car.

The speakers do not emit in every direction at once, so the head rotates to help cover shadowed areas. Indoors and in cars, reflections from walls and glass can help sound travel in several directions even without rotation. Use rotating mode outdoors where reflective surfaces are absent.

Use stationary mode when a quieter setting is needed.

Press twice to start the motor (green LED) or stop it (blue LED).

In large or complex spaces, we recommend one unit near each place where people stay.

Ultrasound does not travel far or easily behind furniture. The app can register multiple units and control them individually with names such as Living room MOSLOCK.

Hold the button (KEY) on the front for three seconds to turn the power on or off.

The LED flashes red when power turns off. First connect power using the supplied C-C cable and a PD adapter.

One button controls four functions according to the number of presses.

Yes. The device button alone controls power, rotation and the mood light.

Use the MOSLOCK app for the timer, light color and brightness, device names and firmware updates.

From the App Store or Google Play, install the 'MOSLOCK' app, then press the device button three times to pair.

1. In the App Store or Google Play, search for 'MOSLOCK'and install it.
2. Press the device button three times in succession. A flashing blue LED indicates pairing mode.
3. Open the app and tap [Add device (+)] in the center of the screen.
4. In the list of detected devices, select 'MOSLOCK_XXXX'and tap [Connect]. The last four digits can be checked on the product label.
5. Once connected, the registered device appears on the home screen.

MOSLOCK uses Bluetooth, not Wi-Fi. Turn on your phone's Bluetooth before pairing.

The last four digits of the device name match the product label. You can rename it in the app.

Tap the device name in the app's device information screen and rename it to something like 'Living room MOSLOCK', 'Child's room'for easier identification.

Set hours, minutes and seconds in the app and tap [Start]. The device turns off when the set time elapses.

Remaining time is displayed during operation. Tap [Stop] at any time to cancel.

Because MOSLOCK connects through Bluetooth rather than Wi-Fi, the timer will not operate if the Bluetooth connection is lost.

Yes. Choose from three brightness levels, eight solid colors and a Multi mode that smoothly changes colors.

Press once to turn the light on or off. Set colors and brightness in the app: White, Warm, Red, Green, Blue, Yellow, Purple and Sky.

Tap [Device update] in the app's device information screen to check for firmware updates.

To let someone else connect or restore initial settings, tap [Reset device] on the same screen. The model, serial number and firmware version also appear here.

The MOSLOCK device, a C-C cable for a PD adapter, and a user manual with warranty information.

A power adapter is not included. Prepare a USB-C PD adapter that supports DC 9 V/2 A output.

Use a Korean KC-certified USB-C PD adapter supporting DC 9 V/2 A or higher. Compatible fast chargers can be used.

An uncertified adapter may cause malfunction, electric shock or fire. Use the supplied C-C cable.

No. MOSLOCK has no built-in battery and must be connected to external power.

Power input is DC 9 V/2 A, using a USB-C PD adapter and the supplied C-C cable.

At MOSLOCK's stated consumption of 3.42 W, running it 24 hours a day for 30 days uses about 2.46 kWh.

Additional cost depends on household consumption, tariff tiers and local rates. Consumption can also vary by operating mode.

This example uses Korean September 2026 rates for low-voltage residential tier 2 (201–400 kWh/month), assuming the added usage does not move the household into another tier.

24 hours/day × 30 days: 3.42 W ÷ 1,000 × 24 × 30 = 2.4624 kWh
Energy charge: 2.4624 × KRW 214.6 ≈ KRW 528
Climate/environment and fuel adjustment charges: 2.4624 × (KRW 9 + KRW 5) ≈ KRW 34
Total: about KRW 563, excluding VAT and the electricity industry fund

Eight hours/day for 30 days uses 0.8208 kWh, or about KRW 188 at the same rates, excluding VAT and the electricity industry fund. The existing household base charge is not added. Actual bills differ with taxes, funds, tier changes, discounts and billing-rounding rules.

Yes, with a USB-C PD adapter supporting the rated DC 9 V/2 A output.

Check that the adapter supports the local voltage and plug type. Ask your airline about import and baggage rules for the device and power accessories.

The model is IF-S1910H. Its Korean Radio Waves Act conformity assessment (KC) number is R-R-ImT-IF-S1910H.

The certification mark is on the label at the bottom of the device.

Kia Collection is a lifestyle product line created to bring Kia's core value of 'Movement'into everyday life.

MOSLOCK is an officially licensed Kia Collection product made by MARKT, with the Kia logo on the device. It is also sold through Kia's official online store, Kia Shop.

MOSLOCK is available from three official retailers: Naver Smart Store, Coupang and Kia Shop, in white and black.

We recommend official retailers for authenticity and warranty coverage.

The MOSLOCK device and C-C cable have a one-year limited warranty from the purchase date.

The retailer and support team explain specific exchange, refund and warranty terms. Functional defects during normal use may be repaired or replaced. Keep your proof of purchase.

Contact MARKT support at +82-2-3487-0700, weekdays 09:00–18:00 Korea Standard Time, closed for lunch 12:00–13:00.

Repair charges may apply even within the warranty in the following cases.

• Service requested when there is no fault
• Water, foreign objects or impact damage such as dropping
• Lost or damaged parts after unauthorized dismantling
• Power-related faults, including use of an uncertified adapter
• Damage from lightning, fire, flooding or other disasters

Repair charges apply after the warranty expires.