Do not charge over 5V the battery will result in damage. Do not direct rays the human eye can cause temporary blindness. Do not allow children to swallow it, please use the product under guardian care. Product Name: USB solar charging bicycle light; Fixed way: 360 rotating lamp holder; Flash mode: high light-flash-weak light often by 2 sec SOS; Product material: PS + ABS; Light source: 3 Watt LED light bulb; Lumen:240LM; Product battery:1000mAh rechargeable lithium battery; Charging time:solar: 10 hours USB: 4 hours; Use time: highlight 4 hours of weak light, flash 8 hours; Waterproof grade: IP64