the t.bone free solo Twin HT 520 MHz, 2-Channel UHF Wireless System, With 2 dynamic handheld transmitters, Directional characteristic: cardioid, Frequency band: 518-536 MHz, 10 Pre-programmed frequency groups with 12 available channels each, 1 User channel, Adjustable squelch with threshold display on the receiver, Frequency scan in the receiver, Adjustable AF output, Adjustable transmission power: 5 mW, 10 mW, 20 mW, Infrared transfer of the settings from the receiver to the transmitter, Pilot tone, Increments of 25 kHz, 19""/ 1 U Housing with 2 BNC outputs for antennas, XLR- and jack output, Operates with a 12V, 500 mA DC power supply (positive polarity (+) inside), Dynamic handheld transmitter with metal housing, LCD display, Operates with 2 AA batteries or rechargeable batteries, Includes a plastic case and rack mount, Suitable microphone holder available under Article Nr #150793# (not included), Optional antenna converters available under Article Nr #177448# (not included)