This mike was sold as an accessory for the SB-400/401 transmitter. The cable mates with the 2 prong jack on the front of those transmitters. It is a dynamic, high impendance mike with a 70-10khz frequency response. It's chrome plated die-cast zinc - built like a tank! It also has a locking button on the press-to-talk lever.

Here are the specs from the instruction sheet:

• Type: Dynamic, high impedance
• Frequency Response: 70hz to 10khz
• Output: 57db below 1 volt per microbar
• Load Impendance: 100kohm minimum
• Max. Switch Current: 1 amp
• Max. Switch Voltage: 125 volts AC or DC
• Material: Die-cast zinc and plastic
• Finish: Satin chrom and gray
• Dimensions: 10" high, 5 1/8" base diameter
• Net weight: 1 3/4 pounds