You do not wanna be late to work or miss your appointment when it was bad weather, such as it was snowing and your car was covered by thick snow. In this situation, you’ll have to wake up at least 20 minutes earlier, so you could scrap the snow off your car windshield. 

If you rely on a regular alarm clock to wake you up, the alarm only goes off at the time you set it. But if it was bad weather for sure you’d screw up your appointment or be late to work. Therefore, you’ll need an alarm clock that can wake you up earlier when it’s bad weather. More of this gadget »