Wireless I/O communication modules can be deployed within a few hours and require no software configuration. The 3–30 Vdc discrete module has four inputs and four outputs, while the analog modules have two inputs and two outputs. Antenna combinations are available with ranges up to four miles (900 MHz) and up to one mile (2.4 GHz). Each system can accommodate up to 16 module pairs, with response time down to 100 ms.