PLEXXA&reg; Car Air Vent Clip Clock, 2-in-1 LCD Digital Automotive Electronic Multi-functional Car Thermometer with Clock/Blue Backlight/Calendar Size: 82 * 24 mm Installation: can be hung on outlet, also can stick on the instrument Features: compact, fashion, new car thermometer clock. Clock, temperature display function with blue backlight, equipped with clamp and double stick, outlet, instrument panel, etc., convenient installation. the clock has a blue back light switch so you can easily check info at night