The SENNHEISER's XSW 1835 is a wireless microphone system that includes dual fixed receiver with inbuilt antennas, two SKM XSW transmitters with mute switches, two MZQ 1 microphone clips, an NT 12-5 CW power source, and four AA batteries.The XSW 1 Dual-Vocal Set is designed with convenience of use in mind, with automatic frequency management and synchronisation via remote channel for quick setup. It also comes with up to ten channels that are compatible.