BT 3440 Main Base Unit ONLY for BT Cordless Phone 090634 090635 090636

For BT Cordless Phone 090634 090635 090636. BT 3440 Main Base Unit ONLY. 1x BT 3440 Main Base Unit ONLY. If requested, I can send a link or an image of the procedure. There may also be demonstration videos on Youtube that may help.