Qatar University has developed a solar-powered hard hat with a built-in fan that reduces the skin temperature of construction workers by up to 10 degrees centigrade. The solar panel on top of the helmet powers a fan to suck in hot air, which is then cooled and filtered onto the worker?s head.
With the Otto system, the lock senses your phone and unlocks the door at the touch of a button. If the phone runs out of battery, there is a pin entry alternative. You can also assign limited-time pins to let housekeepers, delivery people, and dog walkers in at pre-specified times, but can revoke access outside those time windows.?https://www.meetotto.com/
