The Sennheiser EW IEM G4-TWIN-B is an in-ear set with one transmitter and 2x EK IEM G4 receivers, with 2x IE 4 in-ears (earphones). Syncing and setting the transmitter and two receivers is easy thanks to the infrared system and the WSM software that allows you to see all at a glance. The system has a bandwidth of 42 MHz (626-668 MHz), in which you can choose 1680 frequencies and assign 16 channels. With the included GA 3 rackmount you can build the receiver neatly into a 19 rack.Specifications:- Sennheiser EW IEM G4-TWIN-B wireless in-ear set- frequency band B: 626-668 MHz- compatible with WSM software- synchronizes by means of infrared- bandwidth: 42 MHz- range: up to 100 meters- number of channels: 6 banks of 16 channels- RF Mute on / off- mode: stereo, mono and focus mode- engineer mode: the sound engineer can listen in remotelySR IEM G4 transmitter:- bright OLED display- metal housing- adjustable RF power: 10, 30 and 50 mW- connections: 2x XLR/TRS combi (input, L/R), 2x 6.3 mm TRS jack (loop out, L/R), RJ45 (Ethernet), BNC (antenna signal and power supply) and power adapter- dimensions: 202 x 212 x 43 mm (LxWxH)- weight: 980 gr2x EK IEM G4 bodypack:- power: 2x 100 mW- impedance: 32 ohms- battery life: 4-6 hours- power supply: 2 AA batteries or BA 2015 battery available separately- dimensions: 24 x 64 x 82 mm (LxWxH)- weight: 125 gr (including batteries)Included with the TWIN set is:- 1x SR IEM transmitter + 2x EK IEM receiver- 2 IE 4 in-ears- GA 3 rackmount set- aC adapter for receiver- antenna