This item make the sound around the microphone into the FM radio, and mit out to achieve pickup and wireless radio FM mitter, the launch frequency is adjustable, the core board green components is the adjustable capacitor, change the adjustable capacitor can change Launch frequency, adjustable range covering 88-108MHZ GB FM-band.<br> You can use the radio and the phone (the phone with the headset line to do the antenna sensitivity is poor, is not recommended as a receiver) as a receiver! It is widely used in voice pickup mission, audio MIC, the elderly and children sleep monitoring, etc. need to pick up the sound of the occasion!<br> Wiring method: The back of the core panel is labeled +,- and ANT,representing the power positive,negative,and antenna ends.The antenna generally soldered a 0.7 meter long short wire on will be OK,which is very easy!<br> <br> Operating voltage: 0.7V-9V<br> Frequency regulation range: 88-108MHZ (default 100MHz)<br> Launch distance: 9V work, the use of 70 cm antenna, open space, launch distance of 50-100 meters<br> The relationship between the operating voltage (volts) and the supply current (MA) and the mitted power (dBm) is as follows:<br> 9V,24 Ma,9.5dBm<br> 7V,19 Ma,8.5dBm<br> 6V,17 Ma,7.1dBm<br> 5V,14 Ma,6.1dBm(about 5 MW)<br> 4V,12 Ma,4.5dBm<br> 3V,9 Ma,2.2dBm<br> 2V,6 Ma,-1dBm (about 1 MW)<br> 1.5V, 4.2 Ma, -4dBm (about 0.5 MW, general home environment emission enough, green radiation small)<br> 1V, 2.4 Ma, -9dBm<br> 0.7V, 0.9 Ma, -20dBm (i.e. 0.01 MW)<br> Condition:New<br> Type:Voltage Regulator<br> Model Number:Diy Kit Electronic PCB Board Module<br> Application:Computer<br> Supply Voltage:100MHZ<br> color:Photo color<br> Material:plastic<br> <br> Package Contents:<br> 1 x mitter Module<br> <br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. T