Dual vocal set each with 1x EM-XSW 1 DUAL receiver, 2x SKM 835-XSW (dynamic, cardioid), MZQ 1, NT 12-5 CW, frequency range: A (548 - 572MHz). The Sennheiser XSW 1-835 Dual bundles great sound and ease of use into a sleek handheld wireless system. The two included transmitters employ 835 cardioid capsules with a warm, smooth sound, excellent feedback rejection, and superior SPL handling. Convenient features like one-button scanning and synchronization are housed in a streamlined receiver with built-in antennas. Intuitive icon-based indicators make operation a piece of cake. Use up to 10 systems simultaneously. The Sennheiser XSW 1-835 Dual is a great handheld wireless system for singers, presenters, and instrumentalists.