This is a Roland AC-33 acoustic guitar amplifier. The configuration includes the main unit and a third-party AC adapter (12V 4.16A). There is no original box. It will be shipped in a cardboard box. The genuine AC adapter PSB-12U has an unusual voltage of 13V, which is a 1V difference from the one included with this unit. I didn't notice any significant difference when comparing them. Regarding the appearance, it's a used item, so it has some signs of use, but there are no noticeable scratches or stains (in the seller's subjective opinion). I confirmed the operation of each knob on the GUITAR CHANNEL INPUT guitar input using both the AC adapter and batteries. There is some crackling in the VOLUME knob on the lower INPUT, but it only occurs during operation and disappears after rotating it left and right for 1-2 minutes. I don't think it will be a problem in practice, but please be aware of it if you are concerned. I have also confirmed the operation of the MIC/LINE CHANNEL INPUT for microphone (dynamic type), AUX IN, PHONES, and FOOT SW. However, I haven't been able to confirm the LINE OUT as I couldn't think of a way to test it. A major feature of this unit is the looper function. This is a recording and playback function for approximately 40 seconds, and it is unique to this unit in the AC series. You can record your guitar beforehand and then play along with it. The recording will be erased when the power is turned off. This unit can also be operated with batteries. Shipping is included. I do not offer reservations, holds, or face-to-face transactions. Also, the person with the strongest intention to purchase will be given priority, even during negotiations. Delivery will be via either [Rakuraku] or [Yuyu] Mercari delivery, depending on the situation. Please let me know if you have a preference. Shipping may take 1-2 days as it will be processed after work. Thank you for your consideration. For reference, here are some brief specifications: ◆ Dimensions / Weight: Width (W) 318mm, Depth (D) 223mm, Height (H) 243mm 4.7kg (without batteries) ・Speakers: 12 cm x 2 ◆ Current Consumption: 490mA ◆ Rated Output: ・30W (15W + 15W) using AC adapter ・20W (10W + 10W) using alkaline batteries ◆ Battery life during continuous use (using 8 AA batteries) Approximately 8 hours for both alkaline and nickel-metal hydride batteries That's all.