Features 1.USB charging/hand crank /solar charging 2. FM/AM radio 3. LED flashlight 4. External emergency charging Technical info 1. Dimension: 130*50*66mm 2. Weight: approx 231g 3. Maximum power consumption: approx 3W 4. Working voltage: 2.7V?4.2V 5. Battery capacity: 2000mAh (18650 3.7V/2000mAh lithium battery) 6. Battery lifespan: 3 years or more (average working 3 h every day), Cycle charging 500 times 7. Operating temperature range: -10? - +60? 8. Waterproof rating: IPX3 9. Quiescent current:<0.3mA