Lightweight and compact design with a convenient key ring so you're always ready for a quick charge whenever you need it. By integrating new elements into the design, the juice pack reserve is a super compact keychain with integrated charge cables so its ready for you to grab it and go! With the hidden USB Connector, no cables are needed! The Flexible USB and hidden connector stay concealed until you're ready to charge. The USB charging cable and 30-pin iPod/iPhone connector are built-in. The new juice pack reserve features a soft-touch finish exterior, integrated LED charge status indicator, and improved conversion efficiency for maximum power transfer from battery to device. For further ease of use, you can power up the juice pack through the built-in USB cable, which is also hidden on the device. To top it off, invisible LEDs on the bottom keep tabs on charging mode and current battery life of the juice pack.