Sennheiser SK3063-U Professional High-End Wireless Transmitter. Extremely well made. Currently sells for around $2,399.95 at most retailers. Serial number 107389. Note that the top plastic cap on antenna is missing. Includes xlr to lemo cable. Frequency range: 584.200-607.875. If you want, I've also got a matching Countryman B6 mic with a lemo connector to go with it that I'd include for only another $99.00 Here's the transmitter product link for more info: Sennheiser Worldwide - SK 3063-U, transmitter module, wireless pocket transmitter- you can email me at info at aaronmerrill dot com