Features: Simple circuit: It consists of commonly used transistors and resistive and capacitive components, without an audioed voltage converter, making it easy to make. Mineral radio 1.21 edition: Based on the design of Mineral Radio 1.21 Edition, it has good performances and stability, and can reliably receive medium waves amplitudes modulation signals. Medium waves amplitudes modulation transmission: supports the function of medium waves amplitudes modulation transmission, enabling simple wireless communication transmission and experiencing the charm of wireless communication. Good sound quality: Within the rate transmission distance, the sound quality is close to FM broadcasting, and the signal-to-noise ratios is good. Multiple interfaces: designed with various levels of transistors, statical current testing jumpers, and external power sockets, convenient to use, and expandable functionality. Purpose: Suitable for students and DIY enthusiasts interested in radio technology, helping them understand radio principle and control, cultivating scientific and practical abilities, and exercising hands-on and circuit building abilities. Specifications: Material: Printed Circuit Board Type: Loose Part, Finished Board(optional) Frequency range: 525~1605kHz Power supply voltage: 6V Transmitting distance: superheterodyne medium waves radio is about 1 meter, directed type medium waves radio is about 0.5 meter Note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution. Package includes: 1 Piece 1.21 Version Medium Waves Amplitudes Modulation Radio Transmitter Kit