Product Description: 

Battery Capacity : 3.7V 500mAh 1.85Wh
Compatable with :

For Logitech Wireless Mouse
For MX Anywhere2
For MX Anywhere2S
For MX Anywhere3
For MX Master 2
For MX Master 2s 
For MX Master 3
For MX Ergo
                      
Package include: 

1 x 500mAh Original Battery(Without Battery Label)