Focusrite VRM BOX (Virtual Reference Monitoring) Headphone Amplifier with Speaker Simulation The VRM BOX is a USB headphone amplifier equipped with Focusrite's VRM (Virtual Reference Monitoring) technology. Despite its lightweight and compact design, this unit delivers audio quality that fully maximizes the performance of headphones. Its accurate sound reproduction with a dynamic range of up to 108dB and low distortion performance rivals that of expensive audio interfaces, surpassing the performance of typical built-in sound cards in computers (92-93dB). The VRM function built into this unit simulates various locations and speakers. You can select a listening environment, such as a living room, bedroom, or studio, and then choose the speakers to be simulated in that environment. The advantage of monitoring with the VRM function is that you can focus on mixing work as if you were in front of speakers at any time, without being affected by obstacles, and without worrying about the time of day, since you are using headphones. It also has the advantage of making it easier to find subtle noises that are difficult to detect at the volume of actual speakers. The unit is powered via USB bus power, so no power adapter or batteries are required. It also has a built-in 192kHz S/PDIF digital input, allowing it to be connected to devices with S/PDIF outputs, such as ProTools HD. Used only a few times, the condition is very good. The box is not included. Thank you for viewing.