Selling because I no longer use it. There are no accessories, only the main unit. There are no operational problems. It's clean with little use, but please consider it as a used item. ■ Main Features ◎ Four XLR microphone inputs with phantom power ◎ Gain adjustment knobs and mute buttons for each input ◎ Four headphone outputs with independent volume controls ◎ Record four inputs and SOUND PAD to separate tracks ◎ Mix-minus function that automatically removes feedback from the other party's audio ◎ Connect to a smartphone with a single TRRS cable ◎ Four SOUND PADs to which audio files can be assigned ◎ 2-in/2-out USB audio interface with mix-minus function ◎ Direct recording to SD, SDHC, and SDXC cards up to 512GB ◎ Up to 4 hours of operation with 2 AA alkaline batteries, also supports USB bus power ■ Specifications ◎ Input/Output Channels ・ Input Channels: 4 (Mono/Stereo) ・ Output Channels: 1 (Headphone x 4) ◎ Connectors ・ MIC: XLR jack (XLR: Pin 2 HOT) Input Gain: - ∞ ～ + 70 dB Input Impedance: 3 k Ω Maximum Input Level: 0 dBu (@0 dBFS) Phantom Power: +48 V ・ Smartphone Connection Terminal: TRRS mini-jack (4-pole / TIP: L, RING: R, RING: GND, SLEEVE: MIC) Input Impedance: 3 k Ω Maximum Input Level: +3 dBu ・ Headphones: 3.5 mm stereo mini Maximum Output Level: 20 mW + 20 mW @32 Ω Output Impedance: 10 Ω ・ USB: USB Type-C (audio interface function, mass storage function) * Use a USB cable that supports data transfer. Supports USB bus power. ・ DC 5 V: USB Type-C (for power supply) ◎ Power Supply AA batteries x 2 (alkaline dry cell, nickel-metal hydride rechargeable battery, lithium dry cell) AC adapter (ZOOM AD-17): DC 5 V/1 A * Supports USB bus power. ◎ Power Consumption: 5 W ◎ External Dimensions: 112 mm (W) × 155 mm (D) × 47 mm (H) ◎ Weight (main unit only): 290 g