Franterd Power Bank 5V 2A 18650 Power Bank Battery Box Charger For Smartphones plastic Material: plastic. Size:14.8*6.2*2.3cm. Battery Type: 18650 lithium battery is 3.6-3.7Vbatteries not included Compatible for 5x 18650 lithium ion rechargeable batteriesbatteries not included Press Once, to check the electricity of the battery; Press twice, LED lighting is ON or OFF