Features: Compatibility: Suitable for music creation and electronic musical instrument, it fully supports protocol, enabling users to easily connect various devices, such as keyboards, synthesizers and sequencers. Up to 16 channel: support 16 independent signal transmission, realize complex track control, and be suitable for large-scale music performances and recording projects. Design: The expansion board design only take up a small amount of space, which is convenient to be combined with main control board, and improves the cleanliness and aesthetics of the project. A variety of power supply option: it can be power by USB or external power supply, flexibly adapting to different working environment and equipment requirements, especially suitable for mobile performances and laboratory applications. Music production: widely used in music studios as control centers to integrate various sound devices and simplify the creative process. Specifications: Size:Approx.53x57mm/2.09x2.24inch Package Includes: 1Pc Shield Musical Board note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.