Features: 3.5-inch Color Screen & Night Vision: High resolution screen with 2X digital zoom and crystal clear night vision that automatically switches on in the dark. Private & Secure Connection: 2.4GHz wireless connection technology, no access to the insecure Internet. Long Operating Range: Up to 165 feet / 50 meters indoors and 985 feet / 300 meters outdoors. Two-way Talk-back: Long range communication with clear sound effect. Multiple Views: Incorporate up to 4 cameras to take all-around views. ECO Mode: Reduce power consumption during quiet times. The units only connect when the baby makes a sound. Long Operating Time: Provide cordless use for up to 8 hours (under the ECO mode). Temperature Detection: The temperature sensor tracks real-time temperature in baby's room. Alarm: Set a timer(2h/4h/6h) to feed the baby or change the diaper.Specifications: Screen Size: 3.5-inch LCD screen Frequency: 2.4 GHz FHSS Transmission Power: 18 dBm Max Battery in the Parent Unit: 3.7 V, 950 mAh