Feature: 1. 2 Way Audio: Support two way talk communication, when you hear your baby's cry, you can quickly soothe your baby with the baby monitor with clear sound quality. 2. Night Vision: The baby monitor has a high resolution night vision function that enables 24 hour monitoring, and the night vision function allows you to see your cute baby at night. 3. Vox Auto Wake Function: If the baby's volume reaches a certain level, the monitor will be triggered. (The monitor will automatically activate from the screen saver mode) to notify the parents to check the baby's condition. 4. Characteristic: Using 2.4GHz wireless transmission frequency, in line with FCC, CE standards, high resolution 2.4in LCD display, support long range transmission, maximum 200‑300m/218.7‑328.1yd in open area, 5. 4 in 1 Connection: Video baby monitor supports 4 in 1 connection, you can connect 4 cameras with one monitor, the monitor uses lithium battery, which provides convenience for mobile use. Specification: Item Type: Baby Monitor Material: ABS Screen Size: 2.4in LCD Display Screen Resolution: 320x240 RGB Image Resolution: 320x240 QVGA Video Frame Rate: 15-25FPS Signal Strength: Level 4 Volume Control: Level 5 Walkie Talkie: 2 Way Communication Voice Control: Automatic Transmission Frequency: 2.4GHz ISM Band How Wireless Works: FHSS Transmission Power: 19dBm CW Mode Transmission Speed: 3Mbps Transmission Range: Approx. 200-300m/218.7-328.1yd in Open Area Working Current: TX: 400mA MAX. Receive Sensitivity: -96dBm BER=1e-3 Charging Current: 120-200MA Audio Catch Speed: 16K Audio Frequency Response Range: 120Hz - 3KHz MIC Input: 35-50dB Total Harmonic Distortion: <5.0 Signal To Noise Ratio: 46dB Noise Ratio at Night: Approx. 2-3 Meters / 6.6-9.8ft Working Humidity: 20 - 80%RH Working Temperature: 0℃ - 45℃ Battery Type: 750mAh Lithium Battery x 1 (Built in) Plug Voltage: AC100-240V. Package List: 1 x Camera1 x Monitor2 x Power Adapter2 x Expansion Tube2 x Screw1 x Manual