The Nady DKW-Duo Dual Handheld Wireless Microphone System is a cost effective cable-free solution for DJs, karaoke, houses-of-worship, auditoriums, presentations, small performances and more. The Nady DKW-Duo allows for individual or simultaneous wireless operation over two fixed VHF frequencies. The system includes a rugged receiver with dual antennas, and a 1/4" phone output for connection to a PA system. The handheld transmitters feature DM-20B cardioid, dynamic capsules for professional, clear sound quality. The transmitters operate up to 15 hours on single 9V batteries.
 
https://www.bhphotovideo.com/c/product/746205-REG/Nady_DKW_DUO_HT_B_D_DKW_Duo_Dual_Handheld_Wireless.html/overview