Wireless listening device/Cord-less Monitor

components,original circuit design.US Professional IC and STD technics. It has

some characteristic including in tone clean, short antenna,small volume and portable. Our products can be applied to monitoring system, concealed interview, audio-visual education, tour, filed exploring and so on.

Parameter:

1.Transceiver frequency:fixed frequency for ISM/UHF. Using soft-antenna or 2cm fixed antenna.

2.Transmission distance lie on circumstances: up to 1800 meters in open

stadia( Max.4000meter).800 meters with type 'M'. 1000 meters with type 'L'.

3.Both transmitter and receiver adopt a battery( camera battery) with 3V Li-M which fit for CR2

  specification,lasting 36 hours for monitor or 16 hours for transmit. Some options for different connectors are available on request: type 'S' male connector ( input voltage is

7.5V-13.5V,request low ripple power supply, red line is anode), effective Type 'L' (24hours).

4. microphone's sensitivity excel 12dB, high-resolution within 200 square meter (all direction).

Illsustration:

1.       Enclose battery correctly. put power switch to 'ON' position and enter into working

status,Extend microphone's antenna, lay or affix it at 1~5 meters away from voice source. You can monitor the local voice (adujustment free) from 10 meters away after powered on the switch and inserted earphone of receiver (GM900).

2.  With corresponding 3 way connector plugs, you can link recorder with our products in order to record information while monitoring.

3.  The receiver is oriented when voice source is too far. Please adjust the direction of receiver (usually make antenna vertical to the floor and turn arond to find the strongest signal). when used in buildings concentrated area, signal density may varied a lot due to obstruction and multiple reflection, and cause blind spot eventually ( the signal appear faint in short range). How to select the appropriate received spot and the position of monitor is extremely important.Put receiver at elevated or open area. Or close to window as possible when used indoor. The fewer buildingS obstructed between receiver and microphone, the longer transmission distance you will get.

4.  Transmission distance is closely related with operation conditions and weather conditions. Open area is better than  building  concentrated area. Higher is better than lower. Vertical wave( antenna vertical o the floor) is better than horizontal wave.  Suburb is better than downtown. Night is better than daytime. Customer can make good use of microphone and receiver based on the characteristics mentioned above.

5.  Please replace the battery in time in time when transfer distance is getting shortened, or voice is distorted, or hum increased, etc.

Cautions:

1. Please use high performance battery, otherwise duration may be shortened. power off the switch after usage, Be careful at polarity of battery, otherwise the products may be damaged.

2. Emit faint callback when the distance between transmitter and receiver is less than 10 meters. Use same type of transmitter and receiver ( different type may have different frequency).

3.Microphone connector can be carried around or held on hands when making interview. it's normal to have some echo in closed room when voice is very loud.

4.The definition and resolution is determined by the distance between microphone and voice source. There would be voice distorted or damage the eardrum of monitor if shouting to microphone.

5.It's inadvisable to be used at severe radio disturbance or noisy background ( The quietest the background, the best effect. the less disturbance, the longest transmission distance).

6.Don't put the microphone near running computer, TV and the electrical equipment in case to disturb each other. Don't use in metal structure, or in the floor. in the wall, in the basement, otherwise the transmission distance of microphone may be disturbed, or the microphone even can't work.

7. The Products shall be used legally. the user will be full responsible for any illegal usage or any infringement of right cases.