Features1HIGH DECIBEL: The alarm sound can be up to 110 decibels at testing distance of 10cm, which can effectively warn passersby and vehicles. 2CONTROL DISTANCE: This bike alarm supports remote control, with an open distance of 5080 meter, it is recommended to use at 1020 meter. 3BUILT IN BATTERY: Equipped with 500mAh lithium battery, charged for 23 hours, with a standby time of over 30 days, and used for about 15 days. 4CHARGING INDICATOR: When charging, the red indicator remains on, blue flashes, when fully charged, the red indicator goes out, and blue flashes. 5MULTIPLE CONTROLS: 1 host can adapt to 5 remote controls, 1 remote control can control multiple hosts at the same time, support multiple users and multi point control. 6PLASTIC HOUSING: The wireless vibration alarm adopts plastic shell, waterproof and rainproof, with good toughness, can be used in various environments.SpecificationItem Type: Electric Vehicle AlarmMaterial: ABS, Electronic ComponentAlarm Battery Type: 500mAh Lithium Battery (built in battery)Remote Control Battery Type: 3 x 75mAh CR2032 Button Battery (built in battery)Package List1 x Alarm1 x Remote Control1 x Charging Cable2 x Ties1 x Screwdriver3 x Screws1 x Nut4 x Accessories1 x User Manual