This appears to be a specific product code for a Shure audio system, possibly including a microphone and speaker combination.
The 'MT-21076' part number likely refers to a complete package or bundle.
Specific technical specifications would require access to Shure's internal product database or a detailed product manual associated with this part number.
Common specifications for such systems might include:
Frequency response
Output power (for speakers)
Connectivity options (XLR, 1/4", wireless)
Microphone type (dynamic, condenser)
Polar pattern (for microphone)
Impedance
Sensitivity
Dimensions and weight
Without further information directly linked to the 'MT-21076' part number, providing exact specifications is not possible.