Rack mounting kit of the WMS40 Mini and WMS40 Mini Dual series for mounting up to three SR40 Mini receivers in a 19" rack, 1 U.Matching Products AKG WMS40 Mini Dual Vocal Set - ISMWireless microphone set for vocals and speech. The two radio microphones can be operated simultaneously at the two-channel receiver. AKG WMS40 Mini Dual Vocal/Instrumental SetRadio system set for connecting microphones and instruments. On the two-channel receiver, the radio microphone and pocket transmitter can be operated simultaneously. AKG WMS40 Mini Vocal SetWireless microphone set for vocals and speech. It is easy to use, reliable and runs up to 30 hours on one battery. AKG WMS40 Mini Instrumental SetRadio system set for guitar, bass and instruments, consisting of pocket transmitter, receiver and cable. With one battery it runs up to 30 hours. AKG WMS40 Mini Dual Instrumental SetRadio system set for connecting microphones and instruments. At the two-channel receiver, the two pocket transmitters can be operated simultaneously. AKG WMS40 Mini Earmic SetRadio system set with earpiece microphone for speech and singing. With only one AA battery, the system runs up to 30 hours. AKG WMS40 Mini Sport SetRadio system set with headset microphone for vocals and speech. The Sport Set is easy to use and runs up to 30 hours on one battery.