SSB Electronic Power Amp. Nominally 20 watts out. Measured 23 watts out with 741 mW @13.8 volts. Amp is mounted on a massive heatsink (included). Just the PA and heatsink, no relays, etc. Instruction manual, such as it is, included. $150 OBO, shipped anywhere in the continental US. Reply off list. -- Buddy WB4OMG EL98