Mini bicycle alarm system: 56 mm x 75 mm mini anti-theft device, takes up no space. PC + anti-UV material, IP65 waterproof and dustproof, high and low temperature resistance, can be used outside, not afraid of wind and rain. Easy to install wireless bicycle alarm system: brackets, cable ties and double-sided adhesive tape are three installation methods without wiring, suitable for bicycles, motorcycles, scooters, tricycles, cars and other models. Super durable bicycle alarm systems with remote control: the host has a built-in lithium battery, charging via USB-C + reminder for a near low battery, eliminating the hassle of replacing the battery. The fourth version of energy-saving technology, the battery of the remote control is more durable. Super loud multi-functional anti-theft bike: 6-segment alarm sound in car quality, 110 dB loud volume, effective deterrent to thieves and efficient theft protection. Three kinds of electric ringtones can be customized, remote control, one-button turn on, easy to find car! Super sensitive anti-theft protection for bicycle trackers: three-dimensional displacement sensor and special algorithm can accurately identify theft and reduce false alarms. Sensitivity setting with 7 levels, when someone touches, moves, presses or pushes the body, the alarm sounds immediately. The anti-theft bicycle is also suitable for various occasions such as doors and windows.