【Wireless Installation】Easy to install without complicated wiring, suitable for motorcycles, electric bikes, bicycles, and home use. 【High-Volume Alarm】Features a loud 113dB alarm, louder than standard models, to effectively deter thieves. 【USB-C Rechargeable】Convenient USB-C charging port for easy power replenishment of the main alarm unit. 【Weather-Resistant】IP65waterproof rating ensures reliable operation in various weather conditions. 【Remote Control】Includes a remote control with a range of up to 20 meters (66 feet) for easy activation and deactivation. 【Multiple Device Pairing】One alarm unit can be paired with up to three remote controls for added convenience. 【Vibration Detection】Equipped with a sensitive vibration detector to trigger the alarm when tampering is detected. Specifications: Model: SF22R+03C Alarm Volume: 113dB Waterproof Rating: IP65 Charging Method: USB-C Working Frequency: 433.92MHz Wireless Range: 20 meters (66 feet) Alarm Unit Battery: 4.2V 700mAh Lithium battery (included) Remote Control Battery: 12V/27A Alkaline battery (included) Remote Control Pairing: Up to 3 remotes per alarm unit Note: Please charge the device before first use. It can be used normally after activation. It is recommended to fully charge the device before use again.