Amplifier RF Carrier Operated Relay Circuit HF Legal Limit 2000W, I picked this up on ebay and built it includes the optional Capacitor (Included) but never connected the Coax cable to it as I ended up never using it. Has been sitting around mainly due to my lack of times. Seems to be a very nicely designed circuit with good quality parts! As pictured, includes the manual with it if needed. Beyond that, sold as is since I never used it. I think I paid around for it.