This is an assembled RF amplifier + attenuator kit (KEM-RFAMP+ATT) released by Kida Denshi Design, housed in a transparent case. Main Specifications (from the kit's instruction manual) ・Frequency: 0.5 - 100 MHz ・Gain: 10 - 15 dB (varies with frequency) ・Attenuator: 0 - 40 dB (1 dB steps) ・Input Impedance: 50Ω ・Output Impedance: 50Ω ・Power Supply: DC 9V - 12V ・Board Size: 50mm x 50mm ・Dimensions of the transparent case (excluding connectors and rubber feet) Width: 110mm Depth: 80mm Height: 32mm ・Used as an external output amplifier for a DDS oscillator. Operation has been confirmed for this listing. ・The power LED lamp is not installed. ・There is rust on the board mounting bolts on the bottom, and traces of cellophane tape on the transparent case. ・Includes a copy of the instruction manual. #Attenuator #KidaDenshiDesign #AmateurRadio #KEM