The Tesco Dualphone additional DP45 handset is DECT, GAP and VoIP compatible with a 150 names and numbers directory. This additional DP45 allows you to create your own handsets up to a maximum of 5. This GAP compatible handset requires the DP450 in order to be used on the Tesco phone service. Includes handsfree function, colour display and polyphonic ringtones.