The topeak aero combo usb light set safety light combo including both whitelite aero usb 1w amp redlite aero usb 1w topeak aero combo usb light set features rubber strap allows tool free mounting and removal low battery indicator 76x34x31cm 42g each lamp 3 super bright led39s battery 37v 640 mah lithium modes high beam low beam blinking pulse burn time approx 2hr high 4hr low 15hr blinking 50hr pulse charge time approx 2hrs