This is the Behringer 2500 series OSCILLATOR MODULE 1004. An authentic reproduction of the original “System 2500” circuitry from the 70’s that can fit in a standard Eurorack case. The best part? It’s at a very affordable price. Mix the OSCILLATOR MODULE 1004 in with your existing rig or start your modular synth journey from here. Either way you’re sure to have a lot of fun.