STRIKINGLY VISIBLE. REMARKABLY POWERFUL. Varia RearVue 820 features our most powerful and precise radar yet with a wider field of view, giving you more reliable alerts than ever before. The tail light offers up to 2 km (1.24 miles) of visibility and has a brake light that shows when you're slowing or stopping. Features - Tracks vehicles up to 175 meters (more than 190 yards) away with wider field of view - Get up to 24 hours of battery life in day flash mode - Bright tail light is visible up to 2 km (1.24 miles) away - See the size of approaching vehicles - Brake light alerts others that you're slowing or stopping - Stay alert to vehicles traveling at the same speed Included - Varia RearVue 820 radar tail light - Mounting kit - Charging cable - Documentation