1. Product Introduction      The USB-to-Bluetooth MIDI adapter (UTB-21) has the function of transforming the USB MIDI TO HOST interface of the musical instrument into Bluetooth MIDI, so that the instrument has wireless Bluetooth MIDI. This product is compatible with commonly used APP software on the market. This product is compatible with Windows, Mac, iOS, Android and other systems.      2. Product parameters      Model: UTB-21 Length: 2 meters Weight: 110g USB-A Plug: Power supply, use 5V adapter to power the product USB-B Plug: Standard USB MIDI HOST interface, connect the instrument's USB TO HOST interface Indicator Light: Data communication indicator, USB working indicator, Bluetooth wireless working indicator Bluetooth version: Bluetooth Low Energy 5.0 Compatible System: Windows& 12289;Mac& 12289;iOS& 12289;Android Compatible musical instrument brands: Compatible with YAMAHA, Roland, Casio, KORG and other well-known electronic keyboards, MIDI keyboards, electronic drums, etc.      Compatible APP: Compatible with all APPs with Bluetooth MIDI function on the market, such as Garageband, Smart Pianist, Find Piano, Logic Pro X, Cubasis, PA  Player, etc.      3. Product Appearance            & 10102;USB-A Plug& 65292;Used to power the product, use 5V adapter power supply       & 10103;USB-B Plug& 65292;USB TO HOST interface for connecting MIDI devices       & 10104;Work indicator& 65292;From left to right, the communication indicator lights in turn, flashing that the instrument has data communication; USB work indicator light, the light will be on after connecting the instrument; Bluetooth wireless indicator light, always on after connecting to a mobile device, flashing when not connected      4. Product Using       1. Product connection       USB-A uses an adapter to supply power, and USB-B connects to MIDI instruments, as shown& 65306;