D'Addario PW-AG Circuit Breaker Instrument Cable. The D'Addario Circuit Breaker plug has fail-safe operation to save your equipment from loud pops and squeals when you change guitars with a live amp. When the button is pushed, the cable shorts while remaining plugged into your guitar, making on-stage guitar changes a snap, and eliminating any chance of sound bursts. Once the cable is shorted, remove the cable from the guitar being used and plug the cable into the next instrument. Press the button again to re-activate the cable signal. Its that easy! Each plug is plated with 24-karat gold. The D'Addario Circuit Breaker cable is simply the safest way to prevent damage to your equipment live or in the studio. Super solid contact Quality metals Unique technology saves amps Super long life Limited lifetime warranty