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This digital voltage meter and thermometer displays accurate temperate readings in and outside of the car. The unit also alerts you to your car battery's voltage and with its built 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 either blue or 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. temperature record4. Inspect and display real time automobile storage battery voltage.5. Alarm voice and lamp will turn on as voltage icon shows excessive or too low6. Orange and blue backlight is shift able Specifications:1. Display is powered by LR44 button batteries(Included)2. Backlight is powered by cigarette adaptor, suitable for both 12V/24V cars3. Outdoor sensor cable length is 145cm4. Display temperature format in C/F5. Size: 13.5 x 3.2 x 2cm (L x W x H) 6.Temperature range:-50 to +70℃(-58 to +158 F)...