Here you see the buzzer box from outside. I find it nice. Everything is salvaged. I got the rotary switch from a dumpyard raid in Sweden, rated 300 V and 20 A+. The red LED is actually a flashing one. The knobs are for screwind fast electrodes. There are copper washers behind the knobs to prevent any resistive heating due to contact difference. The chassis is my old PC and the very nice handle on the top is my brothers old leather belt.