This high quality speaker selector box is designed to switch and select up to six pairs of stereo speaker systems. All six pairs of speakers can be controlled independently, and any one pair or up to all six pairs of speakers can be played at the same time. Two sets of electrical safety devices for safeguarding the stereo amplifier have been installed to protect the stereo amplifier against shorting of lines and/or open speaker connectors. The constant minimum-load circuit protects the amplifier no matter how many speakers are connected. Button indicator labels customize your selector to make speaker selection fool-proof.