BVenstar Venstar ACC0454 Skyport Wi-Fi Key for ColorTouch Thermostats ReviewbP PP Venstar Venstar ACC0454 Skyport Wi-Fi Key for ColorTouch Thermostats PUpgrades ColorTouch thermostat with Wi-Fi communicationPMonitor and control thermostats via free smartphone apps or any PCPCompatible with T5800, T5900, T6800, and T6900 thermostatsPEasy installationPDimensions: 2.12W x .34D x 1.12H in.