If you need a complete 2-channel wireless system solution for vocal applications, check out the Shure BLX Complete 2-Channel Vocal Wireless Kit with Omnidirectional Lavaliers from B&H. It includes two BLX4 single-channel receivers, a BLX2 handheld transmitter with SM58 capsule, 2 BLX1 bodypack transmitters, 2 cardioid lavalier microphones, and 2 carry cases for storage and protection. Aside from these core items, two XLR cables, a windscreen for the SM58 and a three-pack of windscreens for the lavaliers, and 2 mic clips are also included.
Providing the tools you need for most wireless vocal applications, you can use either one of the lavalier mics and the handheld mic, or both lavalier mics simultaneously, depending on your needs. All wireless components are tuned to Shure's H8 frequency band, between 518 and 542 MHz.