Produino 5V Voltage Boost Mobile Power Module - Green (1A)
Input voltage: 5V 1A Micro USB; Output voltage: 5V 1A USB; Size: 50 x 20 x 10 (mm); Adapt Battery: polymer lithium battery 18650 lithium batteries cell phones etc. (working voltage 3~4.2V) standard lithium battery. LED status indication: Red: Charging; Green: full; Blue: Load; Battery Connection: B+: lithium battery cathode; B-: lithium anode; Please check and verify a good connection is correct before applying power to avoid burning plate