299417 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 Material: plastic Screen size: 5 inches Size: about 12.6 x 6.5 x 2cm Button: MODE / SET / ADJUST / RECEIVE etc. Function parameters: 1. LCD indoor and outdoor double temperature and real-time voltage display， temperature support ℃ / ℉ conversion 2. Car battery voltage real-time monitoring High or low voltage alarm function. 3. Temperature measurement range: outside : -50 ~ 70 ° C (-58 ~ 158 ° F) indoor -10 ~ 60 ° C (14 ~ 140 ° F) 4. Indoor humidity measurements 5. 1 minutes alarm， 5 minutes snooze and keypad tone 6. Support time setting 7. Car power supply， the backlight function Other: Moon round flaw display Convenient car charger power supply Clock function Blue orange backlight Bracket angle adjustment With velcro Note: with button battery CR2032 3V 1 x Car voltage clock thermoneter hygrometer ( within temperature sensor ) 1 x Bracket 1 x Car charger 1 x English manual 1 x Button battery In blister package