Strauss Bicycle Wireless Security Alarm Lock Pack of 50 Simple to operate and easy to install. Only the user can unlock the alarm. It adopts micro-computer technique, having high sensitivity for you. Wireless Vibration Alarm with infra-red remote control. Super loud, simple, easy to Anti-theft. It helps protect your bicycle well, and you don't need to worry about losing it. Effective remote control and alarm sensors 10 meters above the terminal, open area up to 30 meters. Low power consumption to allow the battery a long life. Easy to installation and DIY. Waterproof, but do not immerse the product into water. Recommend use alkaline 9V battery. If in cold winter recommend use cold resistance battery. Please replace batter once the alarm sound lower. Material: Plastic. Package Included: 1 x Vibration Alarm, 1 x Remote Controller, 2 x Screw sets. (Batteries Not Included)