1. Compact and lightweight design for easy carrying.
2. DIY a power bank for your phone.
3. With LCD display show charging progress.
4. Please charge the batteries with USB cable or other chargers.
5. Compatible for 4 x 18650 Li-ion rechargeable batteries (not included).
6. Support voltage and over-current protection, short circuit protection.
7. Widely compatible for iPhone, iPad, Samsung, LG, Sony, MP4, PSP, camera, etc..