Specification: Origin: Mainland China DIY Supplies: ELECTRICAL Hign-concerned Chemical: None Power supply: 9V2A DC, 5.5 interface, positive inside and negative outside (self-provided power supply required) Transmission frequency: 530~1600KHZ (radio medium wave band) High frequency transmission power: adjustable from 20mW to 500mW, adjustable power for use within 5~10 meters. Antenna: 5m home 1.5~2.5 copper wire Audio input: 3.5mm at both ends, included with board accessories Sound source: CD, desktop computer, mobile phone, etc. Applicable: Medium wave radio enthusiasts, for students to study wireless signal generation, AM transmitter audio modulation principle. Product size: 93.00x72.00x18.00mm Product size: 3.66x2.83x0.71inch Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x  AM Radio Transmitter 1. Wide Frequency Range: The am radio transmitter covers a frequency range of 530kHz to 1600kHz, making it adaptable to various AM broadcast bands. 2. High-Quality Signal Transmission: This experimental micropower medium wave transmitter utilizes high-quality signal processing technology, ensuring clear and stable audio transmission. 3. Stable and Reliable Performance: The medium wave transmitter is designed for stable and reliable performance, capable of running for extended periods without faults or signal interruptions. 4. Consistent Operation: The am mw transmitter offers consistent and dependable operation, providing peace of mind for continuous broadcasting. 5. Superior Modulation: The amplitude modulation transmitter delivers superior modulation capabilities, ensuring your broadcasts are transmitted with high fidelity and minimal interference.