1. Simple Circuit: This transmitter uses common transistors and resistors, capacitors, and inductors, and is modulated by an audio transformer. It's a pure AM medium wave transmitter, easy to manufacture and operates smoothly with correct soldering. 2. Excellent Sound Quality: Tests have shown that the sound quality is close to FM radio within the rated transmission distance, with a good signal-to-noise ratio. 3. No external antenna required: The radio transmits the signal entirely through the magnetic field leaked from the ferrite. 4. Multiple Interfaces: External power supply, battery, audio input, and test terminals for easy use and functional expansion. 5. Can be powered by either battery or external power. Simple Debugging: The resistor parameters are pre-matched to the corresponding transistor parameters. Simply solder all components correctly for optimal operation, requiring only adjustment of the band coverage. II. Main Parameters: Effective Transmission Range: Transmission Range: Approximately 1 meter for superheterodyne AM radios; approximately 0.5 meter for direct AM radios. Operating Voltage: 9V Transmitting Frequency: 530-1600kHz Specification:Diy Kits(It's DIY kits, needs to finish by yourself.) Color: As Shown Material: PCB Package Contents: 1 x Radio Medium Wave Transmitter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.