Multi-Functional Waterproof hand winding rechargable dynamo LED Flashlight Alarm function: Make alarm when the red light is flashing Charge mobile phones for urgent use Rechargable Battery: 3.6V80mA Ni-MH environment-protected battery Cranking it or screwing the rump for 1 minute (120 circles), it can continually be used for 10 minutes With a compass in the rump