Power Fail back-up
VTech’s Power Fail back-up system lets you make calls during a mains power interruption with your cordless phone. During a mains power interruption you can supply the power stored in your handset battery to the base unit, so you can make calls even when the power is out.
For single handset packs, place the charged handset in the base unit when mains power fails to make and receive calls via the handset’s speakerphone. For multi handset packs, place a charged handset in the main base unit when mains power fails to make and receive calls either via the power back-up handset’s speakerphone or from any extension handset as normal.