Description:
Charging voltage: DC 4.5V-5.5V (DC 5V recommended)
Charging current : 0-2.1A
Charging quiescent current : 100uA
Full voltage: 4.2V+-1%.
Discharge current: 0-2.4A;
Discharge quiescent current : 50uA
Discharge efficiency: up to 96%
Output voltage: 5V
Output current: 0-2.4A;
Ambient temperature: -20° to +85°
Pin description:
VIN : Charge port positive input +
GND : Charger Negative Input -
BAT : Lithium Battery +
GND : Lithium Battery -
GND : Output negative output -
VOUT: Output Positive Output +
KEY : Output Enable Trigger Port (Low Pulse Trigger)

Use tutorial:
1.In the discharging mode (the charging mode KEY function is invalid), the KEY port is triggered once and the output is turned on; the KEY port is triggered twice in succession and the output is turned off.
2.The first time you access the load, the output is automatically turned on. If the load is less than 50MA, the output will be turned off after 30 seconds; if the load is greater than 50MA, the output will be continuously turned on.
3.When the module is charging, the output will switch the external power supply (it
will be powered off for 0.3s). The charging output voltage will be less than >4.7/ depending on the charger load capacity!
4.Trigger mode: low level trigger (ground)
MCU users, if you accept a small load KEY can be connected to the microcontroller about 20S to give a low level allows the module to continue working!
Connect the user of the single-chip microcomputer, if the small load KEY can be
connected to the single-chip 20S to give a low level, the module can continue to work

Package Included:
5 x 2A 5V Charge Discharge Integrated Module
1 x USB Female Cable