You are looking at an amplifier, Zapco 500watts rms monoblock that is USA made, over 30years in the business and still going strong. The Reference 500/1 features symbalink technology for clean signal transfer with a line driver to boost signal voltage to drive even bigger subwoofers or multiple smaller less hungry subs. The symbalink line driver and 5m+ signal cable is included in the package. Comes with box, manual and condition is 9/10. Note that this black series is originally usa made, not the version that is made in Korea, silver version. Selling to clear storeroom, looking at rm1200 but I am willing to let a good owner steal.it at rm950. Whatsapp or call 0123315669. I have tons of subwoofer choices if you need pairing options.