Features: Suitable for FM walkie-talkie debugging. Built-in 800Hz audio modulation, with the analog digital CTCSS function.The unit is DBM. General hand sensitivity is -120DBM to -130DBM.The greater the sensitivity to a negative number, the higher the sensitivity.The signal source cannot input power.It is forbidden to press the intercom button to transmit when testing. (self-matching power supply 8V-12V power supply polarity is positive and negative)Specifications:Frequency: 0.5MHz-470MHzSignal strength: -70-132dBmBuilt-in 800Hz audio modulation the analog digital CTCSS functionUse 8-12V DC power supply, frequency 7 digitsFor example: 439.6000MHz shows 4396000KHzSignal strength -70-132dBm valid, other values are invalid.Audio modulation is only about 800Hz, other values are invalid.Test methods:During the test, the frequency of the signal source input transceiver is first set to -100DB or any value. The intercom has audio output and then reduces the output strength of . For example, the -120DB just heard the intercom audio signal there noise. The audio signal just hears that the -120DB value of this output is the receiving sensitivity of the radio.size: 155 x 120 x 63mmMaterial: ABScolour: Gray+bluePackage Contents:1 x 0.5MHz-470MHz RF Signal Generator for FM RadioOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.