The CATVSR is a small unit that simply plugs into the jacks on the back of your T.V. set (all plugs are included). Once attached, it maintains the sound levels produced while watching T.V. The CATVSR remembers the sound level that you've set and always keeps that level...regardless of what the network does. The CATVSR increases or decreases the sound level automatically. CATVSR works great in conjunction with VCRs, cable, satellite or surround sound too!

Does Not Work With HDMI Connectors