Traeger Pellet Sensor, Monitors Pellet Level, Directly Integrates Into Traeger App, Alerts When Pellets Reach Low Levels, Compatible With D2 Wifire Enables Grills Only, Includes Traeger Pellet Sensor, Mounting Hardware, & Wiring Pigtail, Compatible With Pro 575, Pro 780, Ironwood 650, Ironwood 885.