Features: This is a 0~55MHz DDS Signal Generator. It is based on AD9850 chip and is very easy to operate. Supports 0~55MHz continual adjust at 1Hz step. With direct digital input frequency With volumes potentiometer With amp. potentiometer,With AGC potentiometer Specifications: Material:PCB S-LED display Standing Wave-LED display Keys & Connection interfaces: ENC: Encoders switches VFO: Transfer from VFO A to VFO B, or from VFO B to VFO A. SSB: Working change: circulate from USB, LSB, AM, CW, and on and on... RIT: Fine tuning to receiving frequency CAL: Set functions KB-1 and KB-2 have common shared pin, but is not GND. Package Includes: 1Piece DDS Signal Generator note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.