【Wireless alarm 】Specially designed for electric bicycle safety, adopts vibration alarm with 10-level adjustable sensitivity. 【Remote 】Support wireless remote control for defense or disarming, easy to install and improve security. 【105dB Alarm The super loud 105dB alarm keeps thieves away; it supports doorbell function and is suitable for home use. 【LED indicator 】With LED indicator, it supports low battery reminder, suitable for installation on window or doors. 【Battery powered 】Powered by 2 AAA alkaline batteries (battery not included), low power consumption, long-term use. Product Description Specification: Item Type: Vibration Alarm Set Material: ABS Function: Remote Control + Doorbell + Adjustable Sensitivity (10 Levels) + 105db Alarm Frequency: 433MHz Function: Alarm; Emergency Alarm; Doorbell Working environment temperature: -10-60 ℃ Working environment humidity: