Operating Band: 2.4GHz frequency band. Automatic pairing connection, plug and play, compatible with all standard 5-pin MIDI device interfaces. Can be used as a MIDI transmitter/receiver, you can purchase another product of the same kind. If the two products are turned on in different gears, they can automatically establish a connection, thereby replacing a midi cable and realizing midi communication between the two products. Delay: Less than 3ms. Effective range: less than equal 15 meters transmission distance. Use time: about 25h. Power supply: built-in rechargeable battery, can be via Type-C. Supports firmware update. Color:Black Material:plastic Package Contents: 1 x SK7 MIDI Adapter 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 and/- 1-3cm.