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CW Telegraph Kit: This is a very small shortwave radio transmitter receive assembled accessory for Forty-9er 3W, with high performance and super durability. The set includes unsoldered circuit board, scattered components kit and circuit diagram. 3W Output Power: The output power is raised to 3W, which has a strong remote communication capabilities, enhance the Forty-9er practicality. Side Tone Circuit: Increasing the side tone circuit, so that when you operate the transmitter, the headset can also listen to the keying signal. Easy to Use: Comes with ciecuit diagram, give you an efficient operation. Perfect After-sale Service: If you have any queston about this product, please contact us and we will do our best effort to serve you.