Features 1. Long transmission distance: medium wave signal can realize wireless communication in a long range. 2. High-frequency transmitting power: adjustable from 20 mW to 500 mW, adjusting the power to be used within 5~10 meters. 3. Strong anti-interference ability: medium wave signals are subject to relatively small interference in the transmission process and have strong anti-interference ability. 4. Good penetration performance: the medium wave signal can penetrate certain buildings, rain, snow and other obstacles, suitable for a variety of environments. 5. Wide range of application: suitable for medium-wave radio enthusiasts, for students to study wireless signal generation, AM transmitter audio modulation principles. Specification Power supply: DC9V/2A Power supply interface: DC 5.5 interface, internal positive and external negative (need to provide their own power supply) Transmission frequency: 530 ~ 1600KHZ (radio medium wave band) High-frequency transmit power: adjustable 20 mW ~ 500 mW, adjust the power in 5 ~ 10 meters to use. Antenna: 1.5 or 2.5 square millimeter diameter household wire can be used, the length of 2~5 meters (need to be self-provided) Audio input: 3.5mm at both ends, attached with the board Audio source: CD, desktop computer, cell phone, etc. Size: 92mm*71mm Applicable: medium wave radio enthusiasts, for students to study wireless signal generation, AM transmitter audio modulation principles. Note: Use and experiment with radio transmitters need to comply with local radio regulations, adjust the amplitude knob to minimize the power adjustment. List 1 x Module 1 x Audio Cable 1 x Accessory kit