Sescom SES-MKP-29 single channel inline balance volume control with input and output 3-pin XLR connectors with volume knob is designed for easy access.
Specifications:
Body Dimensions of black box not including knob and connectors: 3" X 1.25" X 1.25"
Overall Dimensions Including Connectors and Knob: 3" X 3" X 1.25"