Leviton VRC0P-1LW Vizia RF + Plug-In Serial Interface Module RS232 ASCII Interface, White Provides RJ11 to DB9 or RJ11 to RJ11 connector for RS232 or selected Leviton component connection 2-way communication between related controller(s) and module for changes initiated locally Protected memory maintains device ID programming during minor power fluctuations Includes serial cable Requires a third party software to function, along with a relatively high level of programming skill