Dual USB 5V 1A 2.1A Mobile Power Bank 18650 Battery Charger PCB Module Board Micro USB input: 5V 1A USB Output: 5V 2.1A / 5V 1A(Dual USB interface) Charging display: intelligent digital display Batteries Type: liquid lithium-ion batteries (18650) 3.7 lithium-ion battery only Product Size: 57mm x 28mm Screen size: 27mm x 17mm