This device is used to add two loops at 2 or 3 GSC via the AUX connector.
Same quality as other products Glab, I use it to put two pedals in the loop of my amp. not need to supply the order and the power supply cable to come. Two LED status to say she is open loop. The control is done via the button switch on the buttons 6 and 7.
Simple efficient solid, no need power supply in more than happiness.