If you have lost your physical copy, here is what the official Sagemcom CS 50001 manual states:
The Sagemcom CS 50001 is maintenance-free. The official manual states no user-serviceable parts. However, to ensure longevity: contador sagemcom cs 50001 manual
Be cautious of third-party sites charging for the manual. Sagemcom provides user documentation for free. If you have lost your physical copy, here
Plug the power adapter into an outlet and press the button. contador sagemcom cs 50001 manual