The Cordova 2-person indoor infrared sauna is constructed of rich Canadian red cedar wood which adds natural appeal and beauty to any decor. The Sierra uses 7 advanced carbon-nano heaters to provide temperatures up to 140 degrees. Carbon nano heaters offer the latest in infrared carbon heating technology to provide smooth evenly dispersed heat with no hot zones. Standard features include interior and exterior keypads, Bluetooth speaker system, movable ergonomic backrests for maximum comfort, chromatherapy mood lighting and advanced air filtration system.