Material: ABSColor: BlackLED Light Color: BlueQuantity: 1 setVoltage: 12V Size：Dimension: 15.5 x 2.2 x 4.5 cm / 6.1" x 0.8" x 1.7"（LxWxH）Cigarette lighter plug: 7.7 x 2.6 x 1.9cmCable: 1.38mTemperature probe: 2.2 x 0.8cmWire: 2.05mPackage size: 16 x 4.7 x 5.5 cm（LxWxH）Two batteries include Feature:1.This fantastic multi-functional display plugs directly switch Temperature display in centigrade 2.The car's storage battery voltage show function.3.Displaying inside and outside tempreture function.4.Temperature sampling every 20 seconds guarantees accuracy.5.Displays week， day， date， hour and seconds simultaneously as 12 hour or 24 hour system conversion.6.Alarm clock and love to sleep function of 5 minutes. (Bell sign be flicker)7.Flexible and Easy to adjust the angle of item to make it easy for you to see the screen clearly.Freeze Alarm function.8.LED will be in a light when using car power supply， and can display LCD full content. If using a spare battery power supply， not have light， LCD only display time. Key Description:Time Key: Switch display Time/Date， press down 2 second and establish time.ALM Key: Display the bell's time， press down 2 second and establish the bell (with the help of UP Key and Down Key).Left and Right side on ALM key to switch and Hour and MinuteSNZ Key: Love to sleep.(if without need， just don't do it)UP Key: Establish add time abd below the time interface switch display Second/ Week.DOWN/ ??C /??F Key: Establis decrease time， switch ??C / ??F ， at display time interface， press down 2 secondand turn on the alarm frost of the outside(When the alarm frost function open， the temperature bound : -1??C~4??C， can emit alarm for 30 second with the sign be flicker) Package includes:1 x Temperature Voltage Detector1 x Cigarette lighter plug1 x Sensor wire1 x Manual