Features: 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 rechargeable Li-battery in camera, for at least 5 hours continuous working 5. 380TV lines clear picture display 6. Built-in microphone in camera and speaker in receiver 7. Built-in 7 IR lights for 5m night vision range 8. Min. 100m transmission distance without black 9. 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. 10. The product works on the license-exempt 2.4GHz industrial,scientific, and medical(ISM) frequency band. Specification 1. imaging sensor : 1/3-inch CMOS 2. View Angle: 62 degree 3. Frequency: ISM 2,400MHz~2,483MHz 4CH* 4. Transmission Power: 10mW/CE; 2mW/FCC 5. Bandwidth: 18MHz 6. Power Supply: +5?% V Dc 7. Dimensions(W??): 28mm?8mm?8mm 8. Weight: 110g 9. Effective Range: 100Min 10. ChannelFrequency:CH1=2414MHz;CH2=2432MHz;CH3=2450MHz;CH4=2468MHz