Features:  Detect rear vehicles for up to 140 meters away, keeping you alert of the surroundings.  40° wide beam angle, which makes it possible to detect the rear vehicles even at bends and eliminate the blind spot.  220° wide viewing angle, visible up to 1.2km, effectively warn the rear vehicles to ensure a safer riding.  5 lighting modes quickly switches with a simple click: Solid mode, Strobe mode, Pulse mode, Peloton mode, Rador mode.  Compatible with bike computers, watches, or other devices that support the protocol.  Built-in acceleration sensor quickly detects a slight braking.  USB rechargeable battery with long working life up to 16 hours.  IPX7 waterproof protection withstands daily water splashes.    Specifications:  Color: Black  Maximum detection distance: 140m  Horizontal detection angle: 40°  Vertical detection angle -10°~+10°  Relative speed of detective targets: 10-120km/h  Charging port: Type-C  Wireless protocol: BT, ANT+  Waterproof grade: IPX7  Dimensions: 38 * 94 * 25mm/1.5 * 3.7 * 1in  Weight: 65g / 2.3oz    Package List:  1 * Tail light  3  * Rubber Straps  1 * Seat Post Bracket  1 * Type-C Charging Cable  1 * Safety Strap  1 * Manual