Original Mercedes-Benz climate control unit. ✔ Genuine part, part number: A166 900 34 17 (interchangeable with similar numbers) ✔ Condition: fully functional, very good working order ✔ Main compatibility check – same front panel with 4 buttons (AIR FLOW, A/C, REST, REAR) and 2 knobs, as shown in the photos ✔ All connectors are standard across these units Note: Please check the photos carefully and compare with your own unit to ensure compatibility.