The new microprocessor based CW50A features tone, volume and speed controls. The CW50A works with all tube and solid state rigs and is powered by either a 9V battery or an AC adaptor(supplied). Since there is a built in sidetone and speaker system in the keyer it can also be used as a practice keyer for training purposes. It may be used with straight or hand keys,semi-automatic and bug or squeeze keyers. Adjustment of volume of sidetone and frequency is available through the right side cover of the unit. As on all Palstar tuners the front panel and top cover are powdercoated. Unique feature: reed relay mute circuit so that the keyer can be used with the R30C Palstar receiver when used as a stand alone. This provides a convenient muting function for a receiver when using a separate transmitter. All connecting cables, plugs and wall transformer are included.