I believe it's an L.R. Baggs X-BRIDGE and control mixer, and other related components. It also comes with a pickguard with holes for them. (It looks more green than in the photo) *The yellow on the bridge block is masking tape, so please remove it upon arrival. I put in a 9V battery and tapped the piezo, and sound came out. I haven't been able to confirm anything further, so please understand that this is a used item before purchasing. I will sell it with the wiring already done.