• Energy Use: Press 20-30 times and let it light up for 5 minutes without interruption Lighting: Concave led 3 mini bulbs Product Features : Plastic body 10 cm Battery-free, self-charging flashlight! The battery is dead, no more trouble! You won't need anything in this flashlight, such as batteries or light bulbs. Package includes 4 x 3 led Dynamo Lanterns.