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. Support voltage and over-current protection, short circuit protection. Specific parameters: Rechargeable battery specifications: 18650 Termination method: intelligent voltage monitoring Compatible for 4 x 18650 Li-ion rechargeable batteries (not included). Widely compatible for iPhone, iPad, Samsung, LG, Sony, MP4, PSP, camera, etc.. size: 11.5 x 8.1 x 2.5cm Material: plastic colour: B-White Package Contents: 1 x Battery Charger Case Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.