Module combines a TP4056 battery charger with a MT3608 boost circuit. Add a battery and turn low powered DC devices into USB rechargeable devices. Make a rechargeable multimeter Add battery backup to an Ethernet switch Input: 4.5-8V DC Output: 4.3-27V DC (Adjustable) Battery charge termination voltage: 4.2V Battery charge current: 1A Max Battery Discharge current: 2A Max Maximum DC Output: ~7W ( 5V 1.4A / 9V 0.8A / 12V 0.6A ) Size: 3.3x2.3cm