The Cateye Volt 100 XC & Rapid Micro rechargeable light set makes a great commuting setup or emergency light set. The Volt 100 XC & Rapid Micro are what Cateye class as safety lights intended to make you visible to other road users. These compact front & rear LED lights are USB (Universal Serial Bus) rechargeable & can be quickly added or removed from your bike using the rubber straps. On the bike they take up very little room & have a nice sleek minimalist look about them. If you are looking for a good quality rechargeable light set to get you seen on your commute this is it. Cateye Volt 100 XC Front Light 2 modes: Constant / Flash Runtime: 100lm: 1 hr, 100lm: 5 hrs Recharge time: 1.5 hours USB (Universal Serial Bus) rechargeable Opticube Lens Cateye Rapid Micro Rear Light Triple LED 15 lumen output Li-ion Battery USB (Universal Serial Bus) rechargeable 4 modes; Constant, Flashing, Rapid & Pulse Runtime: 3 30 hrs depending on mode Automatic flash when low on battery