This is a Belt-Clip Battery Case that holds 4 AA batteries.
Use it as back-up charger or power supply for any USB powered
device that requires 5VDC. Also features an on/off switch. The
USB Port, in this case, allow you to use your gadget without having
to plug it into the computer. You have the freedom of using your g
adget by taking it with you using this belt-clip battery case.