What Line 6 has to say:
Included as part of the XD-V55 system. For the professional vocalist, this handheld transmitter puts four superb microphone models right in your hand, including three that are based on the world's most popular live sound mics. With the touch of a button on the microphone, you can find the mic model that best fits your unique voice. Features: 12 channels, 4 Superb mic models, Line 6 RF1 and RF2 mode, worldwide license-free operation in the 2.4GHz band, premium dynamic cardioid microphone capsule. Can be used with XD-V75, XD-V70, XD-V55, XD-V35, XD-V30, Relay G90, Relay G50 and Relay G30 receivers. Includes mic stand adaptor.