Dear sir : If you would like go out for travel or camping ,sometime you have been limited by the power ! Can not use your mobile for the communation ,can not use the camera get the beautiful scenery or can not enjoy your music , It is very terrybile ! so now ,our products can help you to solve this trouble ! It will be sure can helpful anytime and any place ! You must like it ! Charging Voltage：9V 3A Output Voltage： 4.5V or 8.4V Rating Capacity： 4500mAh Model： DOKOCOM U2-200 Dimension： 165*100*14.5mm Weight： 430g Fit for Portable mobile terminals，two degrees of voltage output： First : 7.2V output port fits for Portable DVD、VCD、PMP、digital camcorder with 6-9V charging voltage etc 。 1. Portable DVD、VCD、PMP : awaiting time:>5 h ; continuous working time:>3.5h 2. Digital camcorder: awaiting time:>48 h ; continuous working time:>8h Second : 4.5V output port fits for mobile phone、portable game player，MP3，PDA with 3V to 4.5V charging voltage。 1.Mobile phone: awaiting time:960h; continuous working time:>30h 2. Portable game player，MP3，PDA: awaiting time:240h; continuous working time:>72h Please use the batteries under the following environment temperature：-20°C to 60°C。