Clock with outdoor-indoor thermometer and car voltmeter

this voltage voltage and Thermometer Displays Accurate Temperate Readings in and outside of the car. The units also alerts you to your car battery's voltage and with its build in alarm sensor notifies you of excessive or under normal voltage operations. This is the Perfect Accessory for Fine Tuning or Just Spicing Up Your Existing Dashboard with Its EITH BLUE ORANGE BACKLIT display.

features:
1. Indoor and outdoor temperature display, Measuring Range: Indoor: 0 ~ 50 ℃; Outdoor: -50 ~ 70 ℃
2. ICING ALARM LAMP WILL TURN ON AS TEMPERATURE LOWER -1 ℃
3. Max and min. Record temperature
4. Inspect and Display Real Time Automobile Storage Battery Voltage.
5. Alarm Voice and Lamp Will Turn on A as Voltage Icon Shows Excessive or Too Low
6. Orange and Blue Backlight is Shift Able

Specifications:
1. Display Is Powered by LR44 Button Batteres (Included)
2. Backlight is Powered by Cigarette Adapter, Suitable for Both 12v/24v Cars
3. Outdoor Sensor Cable Length is 145cm 4.  temperature display formed in c/f 5. Size: 13.5 x 3.2 x 2cm (l x w x h)