4CH 2.4GHz Wireless DVR Video USB HD Receiver 30FPS Search Features: 4 Channels:channel 1: 2.414GHZ channel 2: 2.432GHZ channel 3: 2.450GHZ channel 4: 2.468GHZ Receive and Record A/V signal from Wireless cameras (up to 4 cameras, auto-scan) Motion Detection 30 fps Video Recording Motion detection: If any intruder, it alarms with sound, and at same time  capture picture saving in hard disk or send e  mail to long-range PC High resolution image capture (1440X1152pix) High speed real time video record, 720 X576 pix@ 30pfs Support MSN Messenger & Skype for long-range live video, like a web camera Sharp and nature image with true color. 4 channels available to avoid possible interference Record file format AVI and play with Windows Media Player Supports Windows 2000/XP/Vista Small size (100X28X15mm,41gs) and beautiful appearance   Functions:   1. Send e-mails attachment with image. 2. Save image on Hard Disk. 3. Sound alarm. 4. Video signal filter, for filtrate Active and Invalid channel. 5. Signal lost alarm. 6. Motion Detection. 7. Adjustable sensitivity. 8. Automatically lock, while not any operate. 9. Schedule Monitoring sessions, for timer snap. 10. Record video/audio (with usb2.0 audio interface), snap shot. 11. Automatic Space Management. Stop automatically if disk is full. 12. Support 4 Channel video inputting on one computer. 13. Support on Screen Display. Display date and time, or channel description on video. 14. Supports manual open/close Invalid channel, or add/delete channel description. 15. Supports login and logout, by User Name and Password. 16. Supports running background stealthy. 17. One video/audio input 18. Receiving Frequency: channel 1: 2.414GHZ channel 2: 2.432GHZ channel 3: 2.450GHZ channel 4: 2.468GHZ Specification: Power Supply:  Provided by USB Port Consumption Current (Max.): 180mA Receiving Frequency: ISM 2,400MHz~2,483MHz Input VSWR: 2:1 Demodulation Type: FM Intermediate Frequency: 480MHz Frequency Stabilization: +/- 100 ppm Local Leakage at RF Input Terminal: <=-55 dBm Receiving Sensitivity: <= -85 dBm Video Output Signal Impedance: 75 ohm Video Output Signal Level: 1.0 V +/- 0.15 Vpp Video Output Signal Polarity: Negative Video S/N Ratio: 38dB Audio Output Signal Impedance: 600 ohm Audio Output Signal Level: 1.25 V +/- 0.25 Vpp / 1 kHz Audio Output Frequency Range: 250 Hz ~ 10 kHz Left Subcarrier Frequency: 6.0 MHz Unobstructed Effective Range: 100 m (Min.) Dimensions(WxLxH): 10X2.8X1.5cm (Excluding Antenna) Weight : 41 g This item includes: 1x 2.4ghz video/Audio USB Receiver 1xAntenna 1xDC/AV cable 1xUser manual