Thank you for viewing. ◎ Operation confirmed. ◇ Product Name: Headphone Amplifier amplug2 ◇ Model Number: AP2-BS Bass ◇ Specifications: Equipped with 9 effects 180-degree rotating storage plug ◇ Size: 86 x 36 x 31mm ◇ Weight: 40g ◇ Batteries: AAA x 2 ※ This is a used item, so there may be scratches and stains. Please check the photos and understand before purchasing.