Cateye light set rapid x rechargeable front and rear the rapid x light set brings safety to a new level when the battery runs low the low battery auto save function automatically changes the light pattern from the current mode to flashing providing an additional hour of riding safety smart design and usb rechargeable 6 modes run times high mode 1 hr low mode 5 hrs flashing mode 30 hrs rapid mode 16 hrs pulse mode 16hrs vibration mode 8 hrs