1. The Step design, which simulates the position relationship between the battery in the mobile phone and the motherboard, avoids flattening the FPC cable and reduces the wear and tear caused by bending. 2. Selected EVA foam protection, comprehensive parts protection, reduce transport collision damage, 9mm super thick buffer. 3. Multi-port charging and output, with three ports of type-c, USB and alligator clip. 4. Intelligently identify the battery's positive and negative poles. Different manufacturers have different positive and negative poles. The power supply is opposite. Smart identification makes using more secure.