1. Car accessories: high quality metal construction for permanent use, mechanical thermometer - Durable metal housing designed for permanent installation in the vehicle - Mechanical thermometer provides reliable readings with no power source required - Built to withstand typical car environments and everyday use 2. Car thermometer: backlight for nighttime readability, mechanical thermometer - Backlit display enables easy reading at night or in low light - Mechanical thermometer with no batteries needed - Clear, quick temperature readings in any lighting conditions 3. Car light thermometer: waterproof design, stay installed for easy cleaning - Waterproof construction suitable for exposed or wet environments - You do not need to remove it for cleaning; designed for simple maintenance - Mechanical thermometer, no power source required Use scenarios - Daily driving comfort: place the thermometer in the vehicle to monitor ambient temperature and help optimize climate control for a comfortable cabin environment - Night driving: use the backlight variant to read temperature quickly and safely without squinting in the dark - Maintenance and cleaning: the waterproof model can remain installed during washing or wet conditions, allowing easy temperature monitoring without removal