Dunlop wah battery box. Original Dunlop snap-in, black battery box with snap-closed swing door for effects pedals using one 9 volt battery (accessed via the bottom of the pedal). Cutout dimensions: 2.46" x 1.27", box depth: 0.70", snaps over a panel thickness of about 0.04". Used on Dunlop Cry Baby Wah Wah GCB95 and many Dunlop effects pedals.