Dual 9 volt battery box. Two 9V battery compartments, each compartment having its own red and black wires for battery positive and negative connections (4 wires total) allowing for series, parallel or separate connections of two 9V batteries.
Four wood screws included.
1. Refer to the Drawing B and make a hole on guitar body. 57.5 mm (2.26") x 49.5 mm (1.95"), R6 (6 mm = 0.24")
2. Put the box in guitar body and fix it by screws. (Drawing 3)