mini size: 3.7 in * 1.6 in, compact with creative design waterproof: PC material shell, IP55 waterproof rating, suitable for outdoor use easy to install: includes two installation options—double-sided sticker and straps—allows stable mounting on bicycles, motorcycles, cars, or other devices two installation methods: double-sided stickers or cable ties; enables secure anti-theft installation on various vehicles and batteries; equipped with 3D displacement sensors and advanced algorithms to accurately detect theft and reduce false alarms from environmental interference SOS help function: automatically activates ble alert if a fall is detected during operation; triggers help signal when tilt exceeds 45 degrees; alert turns off automatically when device is returned to upright position product color: black package quantity: two pieces