MOOER SPARK series. It's a flanger. Operation confirmed. Tested with a 9v external power supply. Probably cannot be battery-powered. Body only. Free shipping via Rakuraku Mercari delivery. I cleaned it as much as possible, but there may still be some remaining dirt. Please refrain from purchasing if you are concerned. As time has passed since the purchase, there may be some crackling when turning the knobs or moving the jacks. Also, since it is a used item, please understand that it is NCNR (No Claim, No Return). No complaints, no returns. Type...Electric Guitar