Handy 9-volt battery compartments for guitars, with built-in terminals and lead wires. The hinged lid with battery cradle opens for easy battery removal (batteries NOT included). Specs: For solidbody guitar — holds 2 batteries Dimensions: 2-3/4" x 2-1/4" (69.85mm x 57.15mm) Cavity depth required: 1-1/4" (31.75mm) Holds two batteries and has two hinged lids, with a 4-screw flange mount; flat mounting surface required. Installation instructions included.