The DVI-1M is a Multiple-connections interface to have one central location to plug into your pedals, tuner and send to the amp with no signal loss or noise. DVI-1M provides Vitalized (Buffered) signal input/output to solve signal loss or noise issues of your signal chain. External mute function with third-party foot switch, Simple and speedy set up at your gigs, Cleanup patch cables mess, Simple hook up to create your pedalboard. Features - DUAL VITALIZER In and Out Vitalizer will keep the original sound as much as possible to low impedance the signal. This will avoid signal deterioration via many signal contacts such as jacks, plugs, switches and long cables. - SEND/RETURN The jacks are located to allow efficient routing of the input/output for your pedalboard system. - TUNER OUT (Can also be used as a parallel output box) Usually, a tuner is connected, but it can also function as a 3 parallel output box by switching the internal switch. - MUTE CTL Using a third-party external latch footswitch for mute function. It will mute the signal at the end of your effect chain when using the Send/Return. This will help to shut the noise or unnecessary sound reflection caused by the pedalboard system. - POP NOISE REDUCTION CIRCUIT The mute circuit uses a relay contact circuit that does not change the sound quality. Besides, a POP noise reduction circuit is also installed to reduce the pop noise when the mute function is switched. - POWER/MUTE (LED) When the power is on, the LED will light blue, when the mute function is active, the LED will blink red. - THRU This THRU is structured as a stereo phone (TRS), and the signal line (Tip and Ring) and the ground line (sleeve) of 2 signals are completely isolated. It can be used for a variety of purposes as switching systems, amp channel selecting and two signal connections to external devices. - WIDE VOLTAGE DC INPUT Various voltages from + 9 V to +18 V are usable. 006P battery is usable as well.