Plug in into a computer, or into a USB-enabled mains charger, and the USB Reserve Power’s internal 950 mAh lithium-ion battery, well, charges.
It’s a Type A USB, and the plug is retractable to protect it from damage. An LED display provides a quick idea of the level of charge available from the device.
Griffin claim the USB Reserve Power will work with “almost any 1 amp USB device or charger”. That covers some smartphones, GPS devices, iPods, etc. See the compatibility chart below.
Buy the Griffin USB Reserve Power
The Griffin USB Reserve Power