The ultimate in adaptable lighting. When running low on juice up front, swap with the rear battery and extend your ride time by up to 50%. • High power rechargeable front with 300 lumen and high power rechargeable rear light with up to 50 lumen• Interchangeable cartridge Li-ion battery• Superlight – only 120g each• USB recharge to head unit• Cartridge rechargeable docking station (sold separately)• Seat rail mounted included (rear)• Flextight bracket included (front)• Helmet mount (sold separately)• Seat post mount rear (sold separately)• Volt 300 Front - 5 modes: High / Medium / Low / Flash / Hyper Constant• Volt 300 Front - Runtimes: H: 3hrs / F: 60hrs• Volt 50 Rear - 4 modes: Constant / Flash / Hyper Constant / Pulse• Volt 50 Rear - Runtimes: C: 8hrs / F: 20hrs