The price is for two units mounted together. The Sennheiser ew 300 IEM G2 is a wireless in-ear personal monitor system and is everything you need for professional in-ear monitoring in any context. High-RF output power for extended range and absolutely reliable transmission ew 300 IEM G2 rack mount transmitter High-quality in-ear personal monitors Power supply Rack mounting kit 9 frequency banks with 12 presets each Stereo-to-double mono switch External contacts for charging 1440 tunable UHF frequencies Pilot tone squelch for eliminating RF interference Automatic frequency scan Switchable hi boost Backlit LCD on transmitter Color change for peak warning Headphone monitoring output 4-status battery display on receiver