Cateye: Punches above its 22g weight and designed for the minimalist, the USB rechargeable Rapid Mini offers 4 modes of eye-catching illumination.• 3 x red SMD LEDs – 25 Lumen output• USB Li-Ion rechargeable battery• Mounting bracket 21.5 – 32mm• Light mode memory• Battery indicator• Battery Auto Save, converts to flashing mode so you’re never left in the dark• Recharge time: 2 hrsMode: RuntimeConstant: 3 hrsRapid: 5 hrsPulse: 20 hrs Flashing: 30 hrs