Yamaha SB7Xc Silent Brass System for Trumpet Internal Microphone: Electric condenser microphone, Pickup Output Jack: Mini phone jack Nominal Level:	-25dB to -35dB, Brass Resonance Modeling: Yes Power Supply: AA alkaline or nickel-metal hydride batteries x 2 (3V DC) sold separately Control:. Volume, Reverb type, Power ON/OFF The Pickup Mute combines a high-performance mute with an internal microphone to pickup sound