Purchased new in 2024. Used only at home for a few months. Works perfectly, comes with the box and power cable. Since I'm not using it, I'll include a TRS-XLR cable as a bonus. Quoted from the manufacturer's website below: A multi-functional microphone preamplifier with four built-in dynamics processors. It improves the sound of your microphone quickly and easily. Recommended for a wide range of scenarios such as streaming, home recording, and speeches. ■ Main Features ・Studio-quality microphone preamplifier circuit ・Classic dbx compressor ・Frequency-adjustable de-esser to reduce sibilance and high-frequency distortion ・Enhancer to complement high/low end ・Program-adaptive expander/gate ・Insert jacks for all connections ・Level meter and status LEDs ・+48V phantom power The 286s is a channel strip processor that incorporates a studio-quality microphone/instrument preamplifier and four processors. The 286s microphone preamplifier is equipped with all the necessary features, including a wide range of input gain control, +48V phantom power, and an 80Hz high-pass filter. Using the patented dbx OverEasy compressor, you can smooth out uneven tracks or achieve the classic "in your face" sound. The frequency-adjustable de-esser eliminates vocal sibilance and high-frequency distortion. The enhancer can add clarity to tracks by fine-tuning the HF control, or clean up the low-mid range by adjusting the LF control. Also, the threshold and ratio controls of the expander/gate can prevent headphone leaks or remove noise from guitar amplifiers. Equipped with easy-to-read LED meters and status LEDs. The microphone input and 1/4" TRS line input support both balanced and unbalanced connections. It can be used for a wide range of sources, including microphones, electronic instruments, and re-amping recording tracks. Using the insert jack, you can insert an external processor (EQ, delay, etc.) between the microphone preamplifier section and the processor section on the signal chain, and by using only one side of the insert jack, you can utilize each section independently.