TECHNOLOGY* 2.4GHz FHSS technology for secure connection and clear sound without interferenceBABY UNIT* VGA camera with vertical angle adjustment, infra-red for night use and digital zoom* Operates on mains power* 5 lullabies and 4 natural sounds with 5 level volume setting* Temperature sensor and monitoring* Speaker/microphone for 2 way communication with parental unitPARENTAL UNIT* 4.3 inch colour display* MJPEG format* Uses rechargeable battery pack for 2.5 hours active video monitoring time before re-charging* LCD for room temperature monitoring* Speaker/microphone for 2 way communication with baby unit* 7 volume levels and volume off* Low battery audible alert* Out of range audible alert* Can monitor up to 4 baby units, with ability to display up to 4 on the screen at one time. Also supports patrolling which auto switches through all registered baby units (with the purchase of additional baby units). Note when in split screen mode only video can be monitored - there is no audio.Operating Range: Up to 300m outdoors, 50m indoors. The actual operating range may vary depending on the environmental conditions and other interferences such as walls, doors and other obstructions.