3V to 5V Step Up Boost Power Module

3 USB 5V 2A Mobile Power Bank Lithium Battery Charger Module 3V to 5V Step Up Boost Power Module 5V 2A 2.1A Power Bank Battery Charger Module 3 USB Step Up Circuit Board 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)