Feature: * compatible with cellular phone, PDA, MP3, digital camera and camera- record, DVD player, USB Device etc.. (all need dc power device) * used high molecule Li battery(polymer) that was conformed with environmental protection. * easy operation and clearly show battery capacity and output voltage value on LCD display * with 13 segmental output voltage range from 3v to 9v * included protection circuit when happen over circuit/over discharge/over charge/ over Temperature * with buzzer alarm and flash light on LCD display when low battery power. * with multinomial charging solution by power adaptor and car''''''''s dc power. * with changeable colors led light under charging condition. (Suitable for TCB-309L) Specification: Measurement(l)*(w)*(h):78mm*62mm*24mm(power pack only) Weight: Approx.120g(power pack only) Input voltage: Dc 15v~24v Charging condition: Voltage: 15v/0.8A(max) Changing time:( 2~2.5 h ours) Battery life:300times 80% 300~500times 60%(12 months) Output dc range:3v,3.5v,4v,4.5v,5v,5.5v,6v,6.5v,7v,7.5v,8v,8.5v,9v Output circuit:1.5A(max) Quantity of batteries:3pcs of high molecule polymer Li battery (4.2v/1.1A) Power energy: Approx.14w Standard Accessories: * pocket power pack * 110v/220v charging power adaptor * 5pcs of exchange output connectors ( included USB Connector)