See also:

During a call
There are some options available during a call. Select one of the following displayed on the screen, if necessary: Hang up: Finish the call. Use Handset: Transfer the call to the cellular pho ...

To turn system off
Press the /OFF button. ...

Battery
● Keep the battery surface clean and dry. Clean the battery with a solution of baking soda and water. ● Make certain the terminal connections are clean and securely tightened. ● ...