Unit has multi-wave upgrade and exhaust fan. There's a slight blemish in the illuminated PS logo as shown in the the photos, but otherwise it's in fine shape, both operationally and cosmetically.
I was using it to precisely control the speed of my Basis turntable. I no longer have the turntable, and my Devialet's power supply seems impervious to AC line noise, so I've decided to sell.
The P300 is ideal for front end equipment i.e. preamp, cd player, media server, turntable or even low power amps. It regenerates AC from the wall and outputs a pure 60hz sinewave.
The multi-wave option allows you to increase the frequency from 60hz up to 120hz. The theory being that higher frequencies increase the effectiveness of power supplies in connected equipment by re-charging their capacitors at a higher rate. The sweet spot for much equipment seems to be 90hz, but you're free to experiment by simply pushing a button on the front display.
Unit ships with owner's manual in it's original manufacturers double box. Buyer pays shipping. No PayPal fees.