STEM与日常科技·英语30篇（9）

22 / 30

冰箱如何在门长时间开启时发送提醒警报

Refrigerators with smart features use magnetic door sensors that check position every ten seconds.
If the door remains open past sixty seconds, it triggers both an internal beep and a phone notification.
The alert stops only when the door fully closes and seals again for three full seconds.
Families with young children find this especially helpful during busy kitchen moments.
Some models add a gentle countdown voice message starting at forty-five seconds to give warning time.
Energy use jumps quickly when doors stay open, so alerts help cut electricity bills month after month.
You can pause notifications during parties or holiday cooking without disabling the safety feature.
The sensor works reliably whether the fridge is full or nearly empty thanks to its placement near the hinge.
No app setup is needed for basic alerts — they activate right out of the box.
Many users say this small function has already saved them from spoiled milk twice this year.