High-quality microphone preamplifier with an analog VU meter and various input/output terminals. As shown in the photos, the item includes only the main unit and the power cable. The power cable is a compatible generic product. There are no box or instruction manual. There are no operational issues. - Model: Focusrite ISA One - Input Terminals: Microphone input, line input, external input - Output Terminals: Main output, digital output - VU Meter: Equipped with an analog VU meter - Power: AC 100-240V, 20W - Features: Insert, return, and send functions A 1-channel microphone preamplifier that inherits the sound of the ISA110, using the Lundahl L1538 transformer, a Focusrite ISA series tradition. Impedance can be changed. In addition to the original ISA110's 1400Ω, you can switch between 600Ω, 2400Ω, and 6800Ω, allowing for optimal settings depending on the microphone used. Equipped with a D.I. function that also allows for guitar and bass input. Equipped with an external input, allowing simultaneous monitoring of the sound input to the ISA One and the output from an external source such as a computer. Equipped with an insert terminal, allowing the use of an equalizer or compressor between the amplifier input section or D.I. input section and the XLR output or optional AD converter output.