YAMAHA Silent Brass for Trumpet SB7-9 Manufacturer's Suggested Retail Price: ¥16,590 This is a set including the pickup mute PM7, the personal studio ST9, and a connection cable (third-party product). Please prepare your own earphones and 9V battery. Operation has been confirmed, and there are no problems. There are some scratches on the main body. Instant purchase is OK. Thank you. 【Product Description】 "ST9" (The new personal studio included with the Silent Brass system) ● Significant downsizing and cost reduction by renewing the configuration and functions By minimizing the interface section, such as input/output terminals, and simplifying the reverb to an on/off echo effect, significant downsizing and weight reduction have been achieved (volume ratio 1/5, weight less than 1/4. Almost MD size). In addition, a strap that can be attached anywhere using a snap and a universal ring is included, greatly improving usability. ● Improved sound quality through circuit optimization and simplification The internal circuits have been completely redesigned and optimized while maintaining a simple configuration. As a result, the deterioration of the performance sound and white noise have been reduced compared to the conventional model, and the sound quality has been improved.