Cateye: Outstanding brightness. Cateye?s brightest and most all-round visible rear light, with 150 Lumen output. Job done!? Ultra bright strip COB LED technology ? maximum 150 Lumen output? USB Li-ion rechargeable battery? Versatile rubber band mounting system ( 12-32mm ) for seatposts and seatstays? Light Mode memory? Battery indicator? Battery Auto Save, converts to flashing mode so you?re never left in the dark? Recharge time: 3 hrsMode: Runtime ( when using the same illumination pattern simultaneously for both LED modules )High: 1 hrLow: 5 hrsFlashing: 30 hrsRapid: 16 hrsPulse: 16 hrs Vibration: 8 hrs