Specifications:

• Input voltage: 5V
  
• Output voltage: 5V
• Input interface: V8 port, micro USB (Android port, flat port)
• This is a DIY box, not a power supply (18650 batteries are not included)
  
• This battery box/box requires a 1PCS 18650 rechargeable battery. If you have a 2600mAh / 3100mAh 18650 rechargeable battery installed, the battery capacity will be 2600mAh / 3100mAh.
  
• The battery has a standard USB output and a micro USB input.
  
• Size: 96 * 24 * 23mm
• Note: You can use the 1800mAh 2200mAh 2600mAh 2800mAh 3400mAh 18650 battery.