1. Long transmission distance: Medium wave signals can achieve wireless communication over a long range. 2. High frequency transmission power: adjustable from 20 milliwatts to 500 milliwatts, with adjustable power for use within 5-10 meters. 3. Strong anti-interference ability: Medium wave signals receive relatively less interference during transmission and have strong anti-interference ability. 4. Good penetration performance: Medium wave signals can penetrate certain buildings, rain and snow obstacles, and are suitable for various environments. 5. Wide applicability: Suitable for medium wave radio enthusiasts, for students to study wireless signal generation, amplitude modulation transmitter audio modulation principles. Parameter: Power supply: DC9V/2A Power interface: DC 5.5 interface, positive inside and negative outside (requires self provided power supply) Transmission frequency: 530~1600KHZ (in the radio frequency band) High frequency transmission power: adjustable from 20 milliwatts to 500 milliwatts, with adjustable power for use within 5-10 meters. Antenna: can use household wires with a diameter of 1.5 or 2.5 square millimeters and a length of 2-5 meters (self provided) Audio input: 3.5mm at both ends, included with board accessories Audio source: CD, desktop computer, mobile phone, etc Size: 92mm x 71mm Suitable for: medium wave radio enthusiasts, for students to study wireless signal generation, amplitude modulation transmitter audio modulation principles. Attention: When using and experimenting with wireless transmitters, it is necessary to comply with local radio regulations and adjust the amplitude knob to minimize power. Material: PCB Color: As shown Package Contents: 1 x Signal generator module 1 set of accessories 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.