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