Put 3 same rechargeable batteries in the box and it turns to be a removable power charger so you can charge your device with either of the interface: 5V USB output and a 12V DC interface.
Features:
Fit for 18650, 32650 and tube covered 26650 battery.
Dual interface: 5V USB output and 5.5mm DC output/input port.
On/off button control, easy to use.
Easy and convenient to fix on bike for charge at any time.
Portable power charger box for smart phone, tablet PC, LED bike light and more compatible device.
Specification:
Material: Plastic
Weight: 220g / 7.7oz
Size: 9.5 * 9 * 8cm / 3.7 * 3.5 * 3.1in
Package weight: 265g / 9.3oz
Package List:
1 * Battery Box
1 * Fastener Tape