You are buying a used but in Good working condition

Extron Electronics DMP 64 

Digital Matrix Processor 60-1054-01

http://www.extron.com/product/product.aspx?id=dmp64

The Extron DMP 64 Digital Matrix Processor is a 6x4 audio mixer featuring Extron ProDSP™, a powerful digital signal processing platform for audio signal routing and control. The DMP 64 offers a configuration approach to DSP that simplifies mixing, routing, and room optimization. Quick and intuitive configuration using the DSP Configurator™ Software allows the DMP 64 to be installed in very little time, with easy-to-learn adjustments that can be heard in real-time. The DMP 64 is ideal for presentation applications that require advanced line and microphone audio matrix mixing with DSP in a small form factor.