Feature 1 SIMPLE CIRCUIT: Radio medium wave transmitter is composed of common transistors and capacitive sense components, and uses sound transformer modulation, and can work normally without welding error. 2 GOOD SIGNAL TO NOISE RATIO: 5301600KHz radio medium wave transmitter has been experimented in the rated transmitting distance sound quality close to FM broadcasting, signal to noise ratio is good. 3 NO EXTERNAL ANTENNA REQUIRED: Radio experimental medium wave transmitter without external antenna, rely entirely on the magnetic bar leakage of the magnetic field radio transmission to the radio. 4 EASY TO USE: Multi interface external power supply, battery, sound input, test terminal, easy to use and expand the function, can use battery power supply, can also use external power supply. 5 SIMPLE COMMISSIONING: Resistor parameters and matching transistor parameters have been matched, as long as all the components are properly welded, you can work well, only need to adjust the band coverage.Item Type: Radio Medium Wave TransmitterMaterial: PCBTransmitting Distance: About 1m / 3.3ft For Super Aberrant CW Radio, About 0.5m / 1.6ft For Direct Discharge CW RadioWorking Voltage: 9VTransmitting Frequency: 530-1600KHz Package List1 x Radio Medium Wave Transmitter1 x Sound Cable1 x Screw Bag1 x Instruction Manual