Brand Name: ELEMENT elements USB MIDI Interface is a 1 in 1 out USB 16 channel MIDI interface to connect your MIDI compatible controller, keyboard, synthesizer, or drum machine to your computer. USB bus-powered, compatible with Windows and Mac. Instructions: 1. Connect the cable marked "In" to "Out" on MIDI keyboard, "Out" to "In" on MIDI keyboard. 2. Plug the USB to Laptop/PC/Mac, LED indicator will show the power on. 3. Open music software program. 4. Set the music software programs MIDI IN/OUT device to USB-Audio-Device. 5. USB MIDI Interface is now ready for use. Attention: If your Mac USB Port is USB-C (Thunderbolt 3), please use authentic USB-C to USB Adapter from the manufacturer or MIDI interface may not work. Interference with other electrical devices: Radios and TVs Placed nearby may cause the reception interference. Operate this unit at a suitable distance from other devices. Size: 16.6*5.5*3.5cm Color: As shown Material: metal shell Package Contents: 1 * MIDI to USB cable Only the above package content, other products are not included. Note: Light shooting 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.