Lithium ion battery:3.6 V/500mAH LED lifetime:5,000hours Switch lifetime:10,000times use it circularly for 500times Specifications: 1) In-built rechargeable Lithium ion battery:3.6 V/500mAH2) Internal battery is powered by hand crank3) Use life: use it circularly for 500 times,.battery recharged more than 500 times 4)LED lifetime:5,000hours5)Switch lifetime:10,000times6)Hand crank 1min lamp bulb ...