Sennheiser SK2000 in A B or G frequencies. These units are brand new with a full factory warranty, fully registered. These are made in and ship from America. Please contact me for further details.  The Sennheiser SK 2000 Bodypack Transmitter is ideal for musicians with its wide frequency ranges and plethora of features. This sturdy transmitter uses 4 RF output powers (10, 30, 50, or 100mW) for extended transmission ranges and more channels per frequency range. The optional rechargeable batteries can be charged inside of the unit with the external charging contacts. Sturdy all-metal housing (including battery compartment) Up to 72MHz switching bandwidth 26 fixed frequency banks with up to 64 compatible presets Frequency setting in 25 kHz steps Pilot tone squelch for interference-free operation External charging contacts for recharging battery BA 2015 in the transmitter Backlit display on transmitter (keystroke activation) Auto-lock feature to prevent buttons from being pressed accidentally Audio and RF MUTE feature for muting the transmitter Wide range of accessories for virtually any use Enhanced audio frequency response in the bass range for optimum transmission from bass guitars Input sensitivity above 60 dB can be set in 3 dB steps Transmitters can be configured from the receiver menu Can be synchronized with the receiver using infrared interface  Specifications: # Of Channels 2,880 FrequenciesPresets: 26 banks, 64 presets each Type of Input Connector Balanced 3-pin Lemo Frequency Response 25Hz to 20kHz RF Output Power 10, 30, 50, 100 mW Housing Metal (including battery housing) Battery Type/Approx. Life 2x AA 1.5V batteries Mute Switch Yes Display Backlit Dimensions 3.23 x 2.52 x 0.94" (82 x 64 x 24mm) Weight 5.64 oz (160g)