VOX : In Vox , the screen on the mother unit is black. Screen will light up when baby starts crying. With enhanced 2.4GHz wireless technology to build a. Automatic : The automatic light sensor precisely detects the light conditions and automatically shifts between day and night modes. Visibility up to 15 feet in complete darkness extends your vision at night. Temperature Monitoring: The camera is equipped with a temperature humidity sensor to ensure your baby is warm and comfortable enough. Room temperature is displayed on the dedicated monitor, so you can be sure your baby isnt too hot or too cold. You also can soothe your baby by playing 8 lullabies remotely. Two Way Audio: The extremely clear two-way audio feature allows conversation both ends as clear as if you were in the same room with your little one. A high sensitivity microphone lets parents monitor every motion, voice or noise from baby. Portability: Application of frequency hopping and digital encryption technology ensures secure and reliable connection. The portable parent unit can move around with you, enabling you to hear, see and talk to your baby no matter where you are in the house. Specification: Material: Plastic Size: 4.3inch Weight: 500g Power Supply: 5V Package Includes: 1 X Baby Monitor 1 X Remote Display Control 2 X US Plug Power Adapters 1 X User Manual 1 X Color Package Box Note: 1. Please ensure your monitor and camera keep a certain distance to avoid the noise. (It is ok to separate the monitor and camera in 1 meter away) 2. Please allow 1-3mm error due to manual measurement.