Hi, this is a barely used 6.1 digital surround sound speakers set, a Sutherland ST-6.1 System. A friend bought these and used them for a short while, but went with a more expensive system, so he put them back into the box and gave them to me to sell. There is a center channel speaker, a passive sub-woofer, and four satellite speakers. They are ready to be connected to your receiver or amplifier, or you can purchase a receiver from me for $20-$100, and i also have higher quality speakers for sale. Sold barely used, just $5, please email, call, or text to come get them, thanks.