ITEM NAME:Alarm Siren Wireless Remote Control Bike Handlebar Bell Anti-theft Description: Electron Loud Alarm: loud enough to attract attention even in noisy place. Anti-theft Alert: when the siren is in the surveillance state, if the bicycle is vibrated, it will alarm with loud sound for 20 seconds. If the bicycle shakes again, a further 20 seconds alarms will follows. Security Surveillance: only the user can unlock the alarm. Remote Control: Effective remote control and alarm sensors 10 meters above the terminal, open area up to 30 meters. Wireless Technology: wireless Vibration Alarm with infra-red remote control. Specification: Alarm:.Anti-theft Alert: when the siren is in the surveillance state, if the bicycle is vibrated, it will alarm with loud sound for 20 seconds. If the bicycle shakes again, a further 20 seconds alarms will follows.