Tomy Walkabout Platinum Digital Baby Monitor: The Tomy Walkabout Platinum Digital Monitor is a fully digital monitor which uses DECT technology with 120 channels for interference free operation and guaranteed privacy. It includes all the same features as the Premier Advance, while the portable parent unit has a vibrate alert which increases as baby's crying increases and a last feed timer switch. Range up to 300m in an open area. Maximum range: 300m Power supply: Mains or battery operated