DECT technology Digital transmission providing superior security and sound quality. Display temperature of baby room Talk back to baby with parent voice from parent unit. Belt chip on parent unit. Rechargeable battery included in the parent unit increase or decrease the volume to suit your needs Indicates whether baby unit is switched on or off Extended range Indoor range is up to 75. Outdoor range is up to 460m Parent unit features 1 parent unit included - portable 1.5 inch 2 way talk - allows you to reassure and comfort from another room Alerts for room temperature too low to too high Notifies you of baby activity with audio alert Vibrating alert Up to 460m range and out of range indicator Low battery indicator Parent unit mains or battery powered Parent unit includes mains adaptor - batteries required for parent unit 1 x NiMH (included). Baby unit features 1 baby unit included Night light - to sooth and comfort baby 5 lullabies Baby unit mains powered only Baby unit includes mains adaptor - batteries required for baby unit 1 x rechargeable(included)