Knuckle Lights Rechargeable--Lights for Running At Night--Night Running Gear Light for Runners--Run Safely In The Dark USB RECHARGEABLE WITH CHARGING DOCK -- Knuckle Lights are so easy to use, simply place the units on the charging dock after each use and they will always be fully charged and ready to go when you are. 2 LIGHTS PER SET -- The units are held comfortably on your hands with soft silicone straps. The straps are easily adjusted to fit any size hand and even over gloves. The units connect together magnetically. 280 TOTAL LUMENS ON HIGH POWER -- The LED pattern is a wide flood beam, putting out light in all directions, providing a steady, even light in front of you that does not bounce around, even with your arms moving. IPX-6 WATERPROOF -- Units can be used in any type of weather and will not leak or fail. These lights for running at night will always keep you safe. 5 YEAR WARRANTY -- Knuckle Lights night running gear are dependable and guaranteed against material defect to keep you running safely in the dark.