The easiest way to install a 9 volt battery into your guitar for use with active electronics (for example preamps, active pickups). This is a small case in which snuggly houses a 9v battery.
On the back of the case is a velcro pad. This pad sticks to the other velcro pad, which has an adhesive layer on the back of it. The adhesive can be stuck anywhere (for example inside an acoustic guitar, inside a control cavity, etc).
9v battery is not included, only photographed forDimensions -
Case length: 65mm
Case width: 40mm
Case depth: 25mm
Velcro pad: 70 x 60mm