The Audio-Technica ATW-1311/L System 10 PRO is a two-channel digital wireless lavalier microphone system featuring a half-rack ATW-RC13 receiver chassis equipped with two ATW-RU13 receiver units. It is well suited for rackmounting in portable flight cases or for permanent installations in educational facilities, conference rooms, small to mid-sized venues, and houses of worship, as well as broadcast studios. The easy-to-use system comes preconfigured at the factory, ready to operate right out of the box with no setup required. Three levels of diversity reception and automatic frequency selection provide seamless, reliable performance with clear digital audio for presenters, lecturers, clergy, and performers. The ATW-1311/L includes two bodypack transmitters and two miniature MT830cW omnidirectional lav mics for hands-free speech for two performers or presenters. The transmitters provides up to 7 hours of continuous use with two AA batteries, at a maximum range of 200'. Up to 10 mic channels can operate simultaneously in the same space. The receiver units can be removed from the chassis and mounted remotely (up to 328' away, connected via an Ethernet cable), for more reliable reception. Up to five chassis can be linked using RJ12 cables, creating a stable environment in which up to 10 receiver units work together, with all receiving, transmitting, and frequency allocation coordinated to prevent audio dropouts.