Key Features 2.4ghz FHSS technology Baby Unit Camera with vertical angle adjustment infra-red for night use and digital zoom and night Light. Operates on mains power 4 soothing sounds temperature sensor speaker/Microphone for 2 way communication with parent unit. Wall Mountable. Temperature sensor Speaker/microphone for 2 way communication with parental unit Wall mountable. Parent Unit 2.8? colour display High Capacity rechargeable battery pack for up to 19hrs acive video monitoring time before re-charging room temperature monitoring speaker/microphone for 2 way communication with baby unit. sound activation mode low battery audible alert out of range audible alert. Can monitor up to 4 baby units (with purchase of additional baby units)