Description: This Car Voltage Meter Clock Thermometer is a multifunctional clock with 4 in 1 function, including time, thermometer, voltmeter and backlight. It can inspect your automobile at real time effectively, there is alarm lamp to remind you to avoid icing may cause damage to your car as temperature lower freezing point. There are alarm voice and lamp to remind you to cheeking the storage battery as the voltage is excessive to too low. You can maintain your automobile by the real time data of voltage. Features: Time / date display, 12 / 24 hour system conversion. Snooze function, snooze time: 5 minutes. Capable of switching temperature display unit Celsius / Fahrenheit degree. Pedestal 180-degree revolve. Car battery voltmeter. Powered by car cigarette lighter charger or 2 x LR44 batteries (included). Display accurate temperature readings in and outside of the car. Alert you to your car battery's voltage and its alarm sensor notifies you of excessive or under normal voltage operations. The LED backlight design allows you to accurately read the digits in the dark. Easy to install and use, a perfect accessory for your car. Also has the function of freeze alert. Specifications: Voltage: DC 12 - 24V Base Diameter: 4.5cm Material: Plastic, glass Power: 0.6W Power cord length: Approx. 150cm Temperature sensing line length: Approx. 200 Stand-by power: 2 x LR44 button cell (included) Temperature measurement range: -10 - 50 degrees Temperature display resolution: 1 degree Temperature accuracy: Plus / minus 1 degree Temperature measuring duration: 60 seconds Features: Portable, Quick reading Display Type: Digital LCD display Power Supply: Build-in battery Material : Plastic Color : Black Package weight: 0.17 kg Product size (L x W x H) : 9.2 x 5.5 x 2.8 cm / 3.62 x 2.16 x 1.10 inches Package size (L x W x H) : 9.5 x 7 x 6 cm / 3.73 x 2.75 x 2.36 inches Package contents: 1 x Car LCD Clock 1 x Cigarette Lighter Charger 1 x Sensor 1 x Double-sided Adhesive Tape 1 x Bilingual User Manual in English and Chinese