Lightweight and compact size to store or carry. Simple to operate and easy to install. It helps protect your bicycle well, and you don't need to worry about losing it. What are you waiting for? Features: Adopted high quality PC material shell, IP 55 waterproof, can use for outdoor. Knocking the door or window can trigger the alarm, which protects your life safety more effectively. Emergency help, sound SOS will remind you of asking help when the accident happens. More accurate catch the theft using three-dimensional displacement sensors and special algorithms. Protect your property safety. Two install methods for you to choose, pasting with double-sided sticker or tie it with strap. Super loud alarm and 7 level adjustable sensitivity, reliable to use. Wireless remote control operation, easier to use, very practical. Compact, small size and classic design for easy to carry. Specification: Condition: 100% Brand New Material: PC Color: Black Alarm size: 9.5 * 4.1 * 2cm / 3.7 * 1.6 * 0.8in Remote controller size: 6 * 3 * 1cm / 2.4 * 1.2 * 0.4in Alarm Volume: 113dB Waterproof: IP55 Loudspeaker Batteries: 3 * 1.5V AAA Remote Controller: 1 * 12V 27A Bell Sound Types: 6 Working Environment Temperature: -20~60℃ Working Environment: