| 
				Pin Number  | 
			
				Pin Name  | 
			Description | 
|---|---|---|
| 1,2 | GND | Ground | 
| 19,20 | V_EXT_CHARGE | External charger + | 
Charger output: 4.75V / 0.55A
5V from USB port are also accepted.
| 
				Pin Number  | 
			
				Pin Name  | 
			Description | 
|---|---|---|
| 1,2 | GND | Ground | 
| 19,20 | V_EXT_CHARGE | External charger + | 
Charger output: 4.75V / 0.55A
5V from USB port are also accepted.