Features: When the bike security alarm is activated,it is sensitive to any vibrations,protects your bicycle from thefts. The alarm sound can reach up to 115db,loud enough to alert you and thefts. Just press the button of controller to find your bike quickly. And the remote range: 0-80 meters. 5 switchable sound modes,3 levels of vibration sensitivity adjustment and 3 levels of volume adjustment. Built-in 400mAh rechargeable battery,convenient to recharge with the provided charging cable. The bell with IPX5 waterproof,offers convenience during rainy days. Come with some brackets and tie straps,easy to install on different bike frames. Wide application for mountain bikes,motorcycles,scooters,strollers,kids bikes,etc. Specification: Material: PC + ABS Package size: 150 * 105 * 46 mm / 5.9 * 3.9 * 1.8 in Package weight: approx. 130.2 g / 4.6 oz Alarm Bell: Sound: 115 dB Waterproof level: IPX5 Battery: 1* built-in 3.7v 400mAh lithium battery(included) Size: 43 * 31 * 46 mm / 1.7 * 1.2 * 1.8 in Weight: approx. 63.1 g / 2.2 oz Remote Controller: Waterproof level: IPX6 Battery: 1* 12v/27a Alkaline battery (included) Remote Range: 0 - 80 meters Size: 58 * 35 * 15 mm / 2.3 * 1.4 * 0.6 in Package List: 1* Alarm Horn 1* Horn Bracket 1* Fixed Screw (for Horn Bracket) 1* Remoto Controller 1* Remoto Controller Bracket 1* Silicone Pad (for Remoto Controller Bracket) 4* Tie Strap 1* USB Charging Cable 1* User Manual