USB Rechargeable, No Battery Replacement Required - The bicycle alarm is powered by a built-in rechargeable 4.2V 700mAh lithium battery, which can be via a DC5V power adapter, the package includes a USB-C charging cable, no need to replace the battery and . The bicycle alarm adopts version 4 energy saving technology and can work for 1~3 months on a full charge (depending on the frequency of the alarm). 3 Mounting Methods for More Uses - Comes with mounting brackets, cable ties and double-sided tape, 3 mounting methods. Bracket installation is more convenient to change the installation position. Zipper ties and double-sided tape are installed, suitable for irregular installation items. Easy to install and use. Bicycle or e-bike or motorcycle owner must have anti-theft alarm. ADJUSTABLE VOLUME AND ADJUSTABLE SENSITIVITY - Loud alarms up to 110 decibels effectively scare away potential thieves and give you peace of mind. Well made bike siren with great performance. 3-level adjustable volume, no need to worry about the alarm being very loud or not. 7 levels of adjustable sensitivity, from light touch to push or tap, easily set according to your needs. Remote Control - Remote wireless control, updated remote control, powerful wireless range up to 164 ~ 260 feet. Vehicle search function, easy to find your vehicle in the parking lot, 3 kinds of ringtones to choose. IP54 waterproof, suitable for outdoor use. MULTI-FUNCTIONAL ALARM - Vibration-triggered alarm, very useful anti-theft product for bicycles, e-bikes, motorcycles, mopeds, scooters, cars, trailers, luggage, doors and ... More Features: Charging level indicator/low battery indicator/long battery life/more alarms and remotes can be added (Note: This alarm kit is not compatible with B0734QN8KR/B01HUSRP7RP7RP7RP70. Colour: Black Material: Plastic Package Contents: 1 * Bike Alarm (including battery) 1 * Remote (including battery) 1