* Filters: Variable Cutoff Low pass filter (SSB/CW) plus two levels of narrow CW bandpass filtering with tunable center frequency.
* Built-in audio amplifier with volume control.
* Dimensions: 5-1/2” L x 2-7/8” W x 7/8” H (14 cm x 7.3 cm x 2.2 cm). Height not including feet or knobs
* Power: 9V battery or external 12 to 14 VDC