MFJ-554x Kit Build Version Oscillator

The world's finest code practice oscillator is designed for demanding classroom use and abuse. It produces a true pure sine wave sidetone with no trace of harsh key clicks. You'll hear the clearest, sweetest-sounding CW you have ever heard.

Delivers full 1 watt into built-in 3 ...The world's finest code practice oscillator is designed for demanding classroom use and abuse. It produces a true pure sine wave sidetone with no trace of harsh key clicks. You'll hear the clearest, sweetest-sounding CW you have ever heard.

Delivers full 1 watt into built-in 3" speaker -- fills an entire room. Low distortion -- less than .2% total harmonic distortion from its BTL (Bridge-Tied-Load) amplifier. Volume control, 400-1000 Hz tone control, on/off switch, power on LED, 1/4 inch key jack, 3.5mm external speaker jack uses 12 VDC.

All metal enclosure. Works with 2 wire keys.