A wireless 2.4 Ghz headset condenser microphone transmitter and receiver. They couple automatically and are easy to operate. You can use up to 4 identical systems at the same tine and both the transmitter and receiver work on rechargeable lithium battery. They will also work perfectly together with battery amps. You get 8 hours of use from a single charge. The SUW 10 is suitable for many different situations, such as presentations, education, events and singing performances. Can be used as a computer microphone and for video sound recording from a distance.