4-in-1 Smart Bike Tail Light - Warning light / Bike brake light / Bike alarm / Electric bike horn 4-in-1 bicycle tail light, controlled by wireless remote control. Reminder to nearby pedestrians and vehicles to avoid, and protect the safety of riders. 4 Light Modes - This rear bike light has 4 light modes: Slow flashing, Breathing, Blinking, and Steady light. When the bike rear light is turned on, if there is a braking action during cycling, the bicycle rear light will highlight in red for 2 seconds to remind the following vehicles and pedestrians, and then return to the previous state. Bike Anti Theft Alarm Function - This bike lights for night riding has a bicycle alarm function and a 7-level adjustable vibration sensitivity. When the "Arm button" is pressed, the bicycle enters the alert state. When someone touches, moves your bike, or tilts the body, the cycling lights for road bike will immediately sound the alarm for 2 seconds. If vibration or movement is still detected within 2 to 12 seconds, the alarm will sound for 30 seconds. Bike Light Rechargeable - This bicycle lights can be charged using the included USB-C charging cable. Charge and activate before use, which can be used for about 1-3 months when fully charged. Bike Horn and Vehicle Search Function - This bicycle rear light has a bicycle horn and vehicle located ringing function. There are 3 ringtones to choose from, and the bicycle can be easily located in the parking lot from a distance through a loud 110 dB e-bike alarm.