The TTW04 Sentinel is Wine Guardian's through-the-wall answer to the central cellar problem: holding temperature within the narrow band that fine wine requires, year after year. It is a self-contained, ductless unit designed for interior through-the-wall installation, sized for small to mid-size cellars and display applications.

Control is the Sentinel's strength. The unit runs on Bluetooth and NFC controls, carries a humidity sensor for seamless humidifier connection, and offers an extended temperature range plus a serving-temperature option that runs from 5 to 18 C, so the same hardware can keep a storage cellar at cellar temperature or hold a display at drinking temperature. Sound reduction foam keeps it at 63.5 dBA.

Wine Guardian notes the unit is not rated for exterior use and must sit in an interior through-the-wall application. The published manufacturer price is USD 6,129.00, with the 50 Hz configuration standard for Europe, Asia, Africa, Australia and New Zealand.