3in1 allinone car meter with builtin cigarette lighter charger for 12V/24V vehicles provides realtime monitoring of battery voltage and interior temperature to help maintain car performance while traveling. Allinone LCD display device Combines digital voltmeter, thermometer, and USB charging port in a compact unit Plugandplay design: simply insert into an existing cigarette lighter socket; no professional installation required Reliable and longlasting performance Made from ABS plastic with stable digital display technology Delivers accurate readings from 9 to 80 C Provides immediate voltage feedback to help avoid lowpower risks during daily use Spacesaving and easy to read Slim black design with a 76 x 47 mm profile Lightweight build that fits into the vehicle dashboard without obstructing view or controls Dual LED screen displays temperature and voltage data clearly Key attributes Compatibility: 12V/24V vehicles Functions: digital voltmeter, thermometer, USB charging port, builtin cigarette lighter charger Material: ABS housing with reliable electronic components Performance: realtime voltage and interior temperature monitoring for better vehicle management Use scenarios Daily commute: monitor battery health and cabin temperature while charging a phone or other device via USB Long road trips: keep an eye on battery voltage and interior temperature to ensure comfort and electrical reliability Extreme weather days: track temperature and voltage to assess vehicle readiness and prevent lowpower issues during startup or idling