1. Small palm size of receiver for mobile usage 2. 2.5" LCD screen with 480 ?234 resolution 3. Rechargeable Li-battery in receiver, enable at least 2 hours continuous working 4. Built-in 9 IR lights for 5m night vision range 5. 380TV lines clear picture display 6. Built-in microphone in camera and speaker in receiver 7. Min. 100m transmission distance without black 8. For Day & Night surveillance, the camera is built in 7 infra-red lights which provide min. 5m night vision range. The night vision function will turn on or off automatically when environment gets dark or bright. 9.Built-in Li-battery in camera 10.Both Video and Audio Monitoring .The product builds in 1/3" CMOS image sensor and microphone, provides 300K pixels high quality display and high sensitive audio monitoring. 11.The product works on the license-exempt 2.4GHz industrial,scientific, and medical(ISM) frequency band.