The Bob Sheppard Signature alto mouthpiece is the result of a collaboration between Bob Sheppard and Eric Falcon of MACSAX ®. Drawing inspiration from the classic alto sound of the 1950’s, this mouthpiece is custom designed to meet Bob's artistic Audio Frequency response (TX): 80Hz - 16kHz Maximum SPL: 149 dB RF output power: 10mW Adjacent channel rejection: 60 dB Intermodulation rejection: 50 dB Diversity design: True diversity THD: < 1 % Signal to noise > 103 dB(A) Range Line of sight: 250' Obstructions: 100' Microphone Capsule: Dynamic Pattern: Cardioid Type: Handheld Battery Type: AA x 2 Life: 10 hours Frequencies Available frequencies: 960 Bandwidth: 24MHz Presets: 12 Banks: 8 Construction Transmitter: ABS plastic Receiver: Metal Dimensions Receiver: 7-7/8 x 1-5/8 x 5" Transmitter: 9-13/16" x 2-1/8" Weight Receiver: 0.5 lb Transmitter: 1.6 lbdemands. Made from pure German hard rubber, the mouthpiece features a unique round chamber and an very gentle baffle contour. The facing curve was designed to allow the player to have great control and flexibility even at the extreme ranges of dynamics. The result is a mouthpiece with a thick, rich, and vibrant sound at any dynamic level.