This is an iRig acoustic guitar contact pickup system. It simply clips into the soundhole of vintage guitars or other instruments where you don't want to drill any holes. I used one each on three vintage guitars, but I sold two of them, so I no longer need two of these. I've transported and stored it in its original box, so the box is worn, but the main unit and case are almost pristine. Please refer to the photos for the condition. Operation has been confirmed. The AA batteries in the photo are for testing purposes, so please use new ones when you use it. Please understand that this is a used item. ※ As mentioned above, I am selling two of these individually, but if you need both, I will discount the price slightly and combine the shipping. Please feel free to ask. Both are in almost the same condition. Thank you. [From the Soundhouse description] The iRig Acoustic Stage consists of a MEMS microphone, about the size of a guitar pick, and an advanced digital preamplifier unit with DSP functions. Setting it up is very easy. Simply attach the MEMS microphone to the soundhole, connect it to the iRig Acoustic Stage's preamplifier unit, and then connect the preamplifier unit to an amplifier or mixer, and you'll have a rich, studio-quality sound on stage. It's an innovative digital microphone system. ■ Clip-on MEMS microphone that can be attached to the soundhole. ■ Preamplifier unit with DSP functions. ■ 1/4-inch AUX input jack for connecting to onboard pickups such as piezo/magnetic pickups. ■ 1/4-inch audio output jack with volume control. ■ Equipped with a USB audio output jack (micro-USB) for recording on computers and mobile devices. ■ Equipped with a feedback prevention function (Cancel Feedback button). ■ 6 types of sound presets. ■ Supports custom calibration function. ■ The clip supports thicknesses up to 4mm, allowing you to attach the microphone to acoustic, electric-acoustic, ukulele, etc. ■ Equipped with a phase switch to optimize the sound when inputting from two sources.