Mobile Phone Power Case Rechargeable Battery Case for Samsung galaxy S9

Details: 

1. 4700mAh high capacity.
2. Fully enclosed protective case.
3. Data transmission
4. Protective circuit for over charging,over using and short circuit.
5. LED Smart power indication
-- Protective and powerful 
-- Full body coverage
-- Portable,light weight and thin design
-- automatic tests function 
-- rechargeable lithium polymer power bank with stand 
-- Full LED lights indicates the power level (each light represent 25% power)
-- ON/OFF button for optional power output control 
-- Free LOGO print and OEM package, design by yourself