Sync Between Transmitter & Receiver: The SLX series transmitters and receivers feature an infrared sync feature which allows settings such as frequency and channel to be transferred remotely * UHF Diversity: The SLX4 receiver features UHF diversity reception. Dual receivers compete for the strongest possible reception, reducing noise and dropout due to RF interference * Mic & Line Level Output: The SLX4 receiver features an XLR mic level and 1/4" phone line level output. The SLX1 bodypack transmitter features a Mic/0 dB/-10 dB switch allowing use with microphones or guitars * Extended Battery Life: The SLX1 bodypack operates up to 8 hours on 2 AA size batteries