Sennheiser XSw 72 Instrument Set C-Band, True Diversity UHF Wireless System with up to 960 switchable frequencies, C-Band 766 - 790 MHz, 24 MHz switchable bandwitdth, 8 banks with 12 channels each, Scan Function to find free frequencies, audio frequencyrange 60 - 16.000 Hz, Jack and XLR out, Set contains SK20 pocket transmitter, EM10 True Diversity 9,5" receiver, NT2-3 powersupplyl, 2x 50 Ohms BNC Antenna, guitar cable, 2x AA batteries. Please note: Due to every country having different regulations, you may need to contact your local licensing authorities before using a wireless system.