Feature: Taillight/Brake light/Anti-theft alarm/Bike bell 4-in-1 function! Reminding the surrounding pedestrians and drivers with light and sound warning, effectively protect the of the car and the ! Warning light automatically light up when passing through a tunnel or during the night rides! Brake light , be highlighted immediately when you brake or ! Arming when parking, deterring thieves and protect your car effectively by loud alarm sound and blink light! PC+ anti-UV material, waterproof and dustproof, high and low temperature resistance, not afraid of wind, rain and severe cold and heat! Product Parameter: 1. Working Frequency: 433.92MHz 2. Storage Temperature: -40 ~ +70 3. Working Environment Humidity: Less than 80% 4. Working Environment Temperature: -40 ~ +70 5. Alarm Charge Port: Standard USB-C 5V (some quick chargers may not be compatible) 6. Alarm Battery: 4.2V 700mAh lithium battery, working time about 1-3 months, standby time about 6 months. Low Battery Warning & Charging: 1. Check whether the remote control indicator can light up. If not or light weak, please replace the remote control battery. 2. The alarm is in low power consumption mode when you receive. In this mode, remote can not control the alarm. Please charge the alarm at least 1 minute to activate before use, otherwise remote can't control the alarm. 3.If alarm have been and activated, remote still doesn' t work, please pair the remote and alarm again. The pairing method please see. Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly, Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour: Picture Color Material: Plastic Package Contents: 1Set * bike alarm Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.