Multi-function Car Voltage Alarm Temperature Thermometer Digital Clock LCD Display with Backlight Options (Blue/green) Date/Hour display,12/24 hour system conversion Alarm Clock,the sound lasts for 60 seconds.Snooze function with 5 minutes interval Enable to detect outdoor & indoor temperature.The freeze-alert function starts working within -1-4 range when the function is on Date/Hour/temperature/voltage display on LED screen with double backlight colors options Suitble for advertising promotion, festival,awards ceremony etc,enable you to make timy & accurate plan