Sennheiser XSW IEM Set A-Band, Wireless UHF In-Ear System, Consisting of transmitter (XSW IEM SR) and pocket receiver (XSW IEM EK), Frequency range A-band: 476 - 500 MHz, Transmitter power: 30 mW, Frequency range: 45 - 15,000 Hz, Switching bandwidth up to 24 MHz, EQ, Limiter, Frequency Presets, Focus Mode, Infrared Sync, Operating time: approx. 6 hours - depending on the volume setting, Transmitter connections: 6.3 mm headphone output, 2x combined input sockets, Receiver connections: 3.5 mm mini jack headphone output, Transmitter dimensions (W x D x H): 200 x 128 x 42 mm, Receiver dimensions (W x D x H): 95 x 70 x 26 mm, Transmitter weight: 700 g, Receiver weight: 110 g, Incl. Sennheiser IE 4 in-ear headphones, XSW rackmount kit, power supply (NT 12-5 CW), 1x BNC omnidirectional antenna, 2x AA batteries