Not sure if they call it that because it is hot like a firecracker? This one is for my acoustic 12 string Breedlove, which already has a built in UST, so this is for blending with or as an alternative. I will probably just drape the cable externally since the piezo UST is already wired through the end pin jack. I will be installing this and using it next week at a Farmers Market, first public show since shutdown. also, I was intrigued by the vibramate string spoiler for my Gretsch, so I picked up one of those, because I like GOLD!