The CP-USBS Combo Light Pack is perfect for commuters. Ride with them into work, then charge them on your computer during the work day, and get ready for the ride home. You can say goodbye to buying batteries since these lights are equipped with USB Rechargeable batteries that will last. Small, compact, lightweight, and easy to install - the CP-USBS is the solution you've been looking for all your bicycle lighting needs.HEAD LIGHT FEATURES: Charge Indicator Light Integrated Mounting Bracket Modes: High, Low, and 2 Flash Modes Run time: Up to 8 hours TAIL LIGHT FEATURES: USB Rechargeable Charge Indicator Light Integrated Mounting Bracket. High = 14 Lumens, Low = 8 Lumens.