Micro USB Charge Module With Protection.
TP4056 Chip Monitors Power by making sure the battery does not drop below voltage or over-charge. 
Also protects against shorting. 
Do not use with cells put in parallel or series, only use with single-cell batteries. 
 
- Aligator Clips are pre-installed for testing and easy charging.
- Can be used for constant power through 5V USB 
- Charging cut-off voltage: 4.2V 
- Maximum charge current: 1AMP 5V 
- Use any Lithium Ion or Lithium Polymer Single Celled Batteries 1000mah or larger. 
- Pre-instaled JST-XH Output Plug as a purchase option