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