1)Material:ABS
2)Battery Type: 3.6V/40MA Lithium Battery
3)Bulit-in 4 super-bright LEDs,no battery required
4)just crank 1 minute,it can continuous work 20 minutes
5)Bulit-in output jack can support mobile phone,crank one minute can support mobile phone to talk up to 2-5 minutes.(not include mobile phone charger)