Uniden DECT 1705 uses the Wireless Friendly DECT technology. Now the additional handset is available, allowing connection of up to 6 handsets from the one phone line to suit larger households making life easier. We've introduced a handy feature Blackout Power Failure Protection Feature. When a Power Failure occurs, the charged handset temporarily supplies power to the base unit. You can then make and receives calls using a handset.