Power Bank 3 USB 5V 2.1A Battery Charger Step Up board

Features:

Apply Battery Type: 18650 battery(not include)

Output Voltage:  5V  2.1A

Input Voltage: 5V 1A

Instructions: Level 4 Capacity indicator

Lighting: with LED lights

Rated Voltage: 3.7V ( Suit for 3.2V-4.2V. The batteries are in parallel)

Size: 62×18×8mm/2.44×0.71×0.31in