Kindly Note: Supports WINDOWS only. The Twin Looper combines all essential looper function. It allows you to play loops in reverse, you can reverse loops or slow them down to fast, half-speed or both at the same time. As you might imagine, it can make for a subtle performance or a jaw dropping show that makes the audience stop dead in their tracks. Its ultra simple design and guitar-center features like true-bypass, analog dry-through, high quality audio. With 10 minutes of looping time and unlimited overdubs and undo/redo functionality, Twin Looper is the perfect blend of quality, creativity and simplicity. About the USB Interface When connect to computer with USB cable, two yellow LED will light up and at the same time, and you can operate the user software. Please notice the USB jack is not for power in. How Use The Software? Import music: Click the [Import] button and chose a path to store the file. The file format is mono 48 KHz 24 bit wave; Export music: Click the [Export] button and chose a file to load. The file format must be mono/stereo 48 KHz/44.1Khz 16bit/24bit wave. The stereo wave file only loads the left channel. Specifications: Input: Two 1/4 Jacks (Impedance: 470k Ohms) Output: Two 1/4 Jacks (Impedance: 100 Ohms) Sampling Rate: 44.1K Sampling Accuracy: 24bit 105 dB Dynamic Range Working current: 100 mA Power Supply: 9V AC adapter (positive Tip) Dimensions: 116mm (D)*90mm (W)*35mm (H) Item Weight: 500g