Samson Concert 77 Guitar True Diversity UHF Wireless System (Channel N4) True Diversity UHF Wireless System with PLL Frequency Control Multi-segment Audio level, RF level and A/B Antenna Operation LED meters Squelch control eliminates carrier signal noise and RF interference Tuned molded antennas for accurate reception XLR and unbalanced 1/4-inch outputs with mic/line level output switch