Some claim there is a 9MHz band that you caan still use, but the law says that is not true since these units can transmit outside that 9 MHZ band they are illegal (or will be). The ULXS4 receiver works with the following Shure ULX Series microphones and more. Cardioids - SM58 (ULX258J1), Beta 87C (ULX2B87CJ1).Super Cardioids - SM87 (ULX287J1), Beta 58A (ULX2B58AJ1), Beta 87A (ULX2B87AJ1). Operates on M1 band 662-698MHz - ILLEGAL after Jan 2020. MODE Button for Menu Display. SET Button for Saving Settings. XLR and 1/4 outputs with level control. Listing and template services provided by inkFrog. The item "Shure ULXS14-M1 wireless mic receiver & transmitter 662-698 MHz. Not Legal" is in sale since Friday, April 26, 2019. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Microphones & Wireless Systems". The seller is "bodymics" and is located in Somerset, New Jersey. This item can be shipped worldwide.