1. Compact and lightweight design for easy carrying.
2. DIY a power bank for your phone.
3. Indicator light 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. Widely compatible for iPhone, Samsung, LG, Sony, MP4, etc..
7. Design with LCD display, can display output voltage and output current, charging status.