SainSmart Forty-9er 3W HAM Radio QRP Kit CW Shortwave Radio Transmitter Receiver Telegraph The output power is raised to 3W, power output using an American ring, it has a strong remote communication capabilities, enhance the Forty-9er practicality! When the vibration frequency of the kit launch fixed 7.023MHz, when receiving the vibration frequency is 7.023-7.026MHz. PCB size is 6cm * 6cm The kit can be easily placed in the PCB 65mm * 35mm * 100mm standard aluminum shell, the kit does not include this housing. If there is a need to contact me Increasing the side tone circuit, so that when you operate the transmitter, the headset can also listen to the keying signal, side tone circuit using an audio sine wave generator, the effect was significantly better than the ordinary sense of hearing frogs square wave generator 1-year warranty and technical support dedicated from SainSmart