Extremely powerful combo set for road or off-road use, powerful enough for fast paced trail riding Headlight: Best in class lumens per dollar Boost mode unleashed maximum LED output 4 light levels plus 4 daylight flash modes Low battery indicator Tail light: Intensely bright rear light Group Ride Mode - be seen without distracting fellow cyclists Easy on and off seat post strap mount with quick release tab Super bright day time flash mode 4 modes inlcuding 2 steady and 2 flash modes Integrated low battery indicator light Black 5F/4R Combo Handlebar/Seatpost USB 1200UPC/EAN/GTIN: 702699067882