Product Description: Quantity: one set Color: Black Host built-in battery: 4.2V 700mAh lithium battery for 1-3 months daily use, continuous standby for about 6 months. Interface of charging: standard USB-C 5V (some fast charging heads are not compatible) Remote control battery: WL03C: 1 alkaline battery 27A (12V) 1 to 2 years of daily use (calculated by remote control 5 times a day) WL09C: 1 CR2032 (3V) button battery 2 - 4 years of daily use (calculated by remote control 5 times a day) Transmission and reception frequency: 433.92 MHz Working environment temperature: -40-and70C Working environment humidity: < 80 percent Ambient storage temperature: -40-and70C Sensitive DetectionWhen triggered, the super loud sound up to 110 decibels will be a great deterrent, effectively scaring away thieves, and also help you to chase away strangers who are sitting on the bike without permission, volume or sensitivity can be adjusted as needed. USB Rechargeable Say goodbye to the hassle of replacing batteries, the Cruxer bike alarm clock is charged with a USB-C cable (included) and can be used for up to 1-3 months after being fully charged. Multifunctional AlarmThis high sensitivity vibration triggered alarm is suitable for motorcycles, bicycles electric, motorcycles, scooters, trailers and luggage. Support for multiple remote or alarm pairings. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.