It is suitable for 5-5.5V digital electronic product such as cellphones, MP3, MP4, digital cameras, bluetooth headset, etc. Connect the mobile phone or digital products through connecting cable and conversion adapter, and then perform charge. Two cells of AA rechargeable batteries to be charged through AC adapter, and the indicator light shows red when charging. And charging time depending on the capacity of the battery. It can be used as a portable flashlight to facilitate travel at night. Rapid conversion, minimal power consumption, and the energy of the 2 batteries can be converted into mobile phones or digital products in a very short time, which is really time-saving. The remain energy can continue to be used for lighting. The use of battery: 2 cells of AA alkaline, carbon, lithium batteries or rechargeable batteries. Output voltage: 5.5V (Maximum). Input voltage: 5-5.5V. Input current: 240-400mAh. Battery conversion rate: 88%.