VocoPro US-3 U-Series Wireless Saxophone System Securly Fastens Onto Saxaphone. Diversity Receiver Design Reduces Dropouts Caused by. Multipathing and Interference 16 Operating Channels Allow for Multiple Sets to be Used. Simultaneously Operating Range of up to 150 Feet. Adjustable Squelch Control to Minimize Outside Interference. Receiver Can Operate on 2 AA Batteries or DC Power Adapter. Weight: 2 lbs