I used "thr 2" but it became unnecessary when I switched to Spark 2. 【High-Quality Looping Function】 XSonic's ULoooper is a high-quality looper perfect for guitarists and music production. With simple operation, you can instantly layer sounds. 【Diverse Power Options】 In addition to a 9V power supply, power can also be supplied via a USB port. This makes it easy to use in various environments. 【Compact Design】 Its compact size makes it convenient to carry, perfect for studio or live performances. - Brand: XSonic - Model Name: ULoooper - Power Supply: 9V power supply or USB port - Connection Ports: USB port, Reserved port - Control: LEVEL knob Thank you for viewing.