Product Description: 1. Supports low-power Bluetooth (5.1) connection, ultra-low latency and more stable 2. Supports USB direct connection and MIDI data transmission without delay 3. Supports automatic shutdown to save power, lower power consumption, longer battery life 5. Built-in rechargeable key battery, short charging time, environmentally friendly and energy-saving Supported systems: ios, Windows, Android, Mac os, Linux, etc note: With the words "SKY MIDIER" Material: ABS colour: black Package Contents: 1 x Bluetooth MIDI controller 1 x cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.