This Hybrid flashlight has it all, solar powered and charges from any light source, leave it out in your work area or on your dash and it will always be ready. Put it in the glove box fully charged and it will be ready 2 years later!! First push of the on switch and you are using solar power 2nd push and you are using the Lithium backup batteries....Waterproof and it floats!! NiMh charging system and back up lithium batteries - Lifelong rechargeable system. Backup batteries over 50 hours of use and a 7 year shelf life.