Philips CD4451B Cordless phone answer machine. Multi handset capability: Up to 5 handsets, VIP group with own melody: Yes, 3 groups. Volume control: Volume Control up/down. Phonebook capacity: 100 entries. Display: Dot-Matrix STN, Backlight colour: Blue. Base dimensions: 116 x 110 x 81 mm, Handset dimensions: 46 x 26 x 160 mm