Miditech Midi Thru 4 / Filter - MIDI thru signal distributor with 4 channels, featuring an integrated MIDI filter, providing one MIDI input, 4 MIDI thru outputs, an LED indicator for the MIDI input signal, a Panic button, and 8 DIP switches for filter settings, powered via MIDI. Dimensions 119 x 56 x 34 mm.
Excellent communication with the seller. Unexpectedly fast delivery. The product worked flawlessly for exactly 2 years, after which it died. It couldn't be repaired. It was the cheapest, maybe a more expensive one lasts longer.