290688 Multi-function car LCD digital display with clock display， real-time monitoring of temperature， air humidity and auto voltage， to ensure the safety of your driving With velcro， easy to install Color: black Size: about 13.5 x 3.5 x 2.0cm Material: plastic Function parameters: 1. Indoor and outdoor temperature display， measuring range: indoor : 0 - 50 ℃， outdoor : -50 ℃ - 70 ℃ 2. Freezing warning light will illuminate temperature: low 1 ℃. 3. Support for real-time display and check the car battery voltage. 4. 12 / 24 hours format dispaly 5. Display real-time indoor and outdoor temperature ℃ / ℉ display 6. The alarm sounds and lights will be lit as voltage icon dispaly 7. Orange and blue backlight can move 8. Car power plug 9. Back with magic tape Note: 1. Long press ℃ / ℉ to select time format 2. With button batteries (LR44) 1 x Car LCD digital clock voltage temperature monitor ( within car charger and temperature sensor ) 1 x English manual In blister package