I bought this just to play King Gnu's "Vinyl" and then left it unused! Please be sure to check the images as there are some scratches! There are no malfunctions at all, but I used it occasionally for about a month, so it's still considered used. Having one of these is a great asset, the sound quality is amazing! I'll include an AC adapter that I purchased separately as a bonus! 【Product Details (Copied and Pasted)】 ↓↓↓ Main Features 52 types of bass effects, 6 types of bass amp models Up to 4 effects can be used simultaneously Flexible effect chain 50 patch memories that can program the order of recall 30 built-in preset patches Chromatic tuner that can be instantly called up with a footswitch Tap tempo function convenient for setting delay time and modulation cycle Auto-save function that automatically saves edited parameters Bass input terminal compatible with both active/passive Stereo output terminals that can take advantage of the stereo effects of spatial effects LCD with backlight for high visibility even in dark environments such as on stage Specifications Effect types (Ver.2): 142 Simultaneous effects: 4 Patch memory: 50 Preset patches: 30 Sampling frequency: 44.1 kHz A/D conversion: 24-bit 128x oversampling D/A conversion: 24-bit 128x oversampling Signal processing: 32-bit floating point + 32-bit fixed point Frequency characteristics: 20Hz ～ 20kHz +1dB - 3dB (at 10kΩ load) Display: LCD Input: Standard phone jack Rated input level: -20 dBm* Input impedance: 1MΩ Output: 2 × Standard phone jack (L / R) Maximum output level: +5 dBm (when output load impedance is 10kΩ or more) Batteries: 2 x AA batteries Continuous operating time: 7 hours (when using alkaline batteries) AC adapter (optional): DC9V / center minus / 500mA (Zoom AD-16) USB: Bus power, firmware update External dimensions: 130.3 (D) x 77.5 (W) x 58.5 (H) mm Weight: 350g