E-I/O Box supporting 16 sensors in/ relays out is one accessory that provides a big advantage to users. The service provided by E-I/O box includes supporting 3 kinds of interface to connect to AVerDiGi NV/ SA DVR and expanding up to 128 sensors in/ relays out. This E-I/O Box is easy to use and allows us to identify sensor/ relay status via LED light.