Shure SLX124/85/SM58 Combo Wireless System, J3 Shure SLX4 Diversity Receiver - SLX2 Handheld Transmitter with SM58 Capsule - SLX1 Bodypack Transmitter - WL185 Lavalier Microphone - Zipper Bag - Short Rack Mount Bar - Long Rack Mount Bar - Link Bar - 2 x 1/4 Wave Antennas - Antenna Extension Cables - Protective Bumpers with 8 Screws - 4 x AA Batteries - Shure Warranty 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