While smartphones are awesome little computers, one of the things that really makes them useful is their built-in sensors ... reached at a distance of up to 50 meters (164 feet).

It was a long time coming, but Nest has finally released its remote ... shaped sensors measure about two inches in diameter and can rest on a flat surface or be hung on a wall up to 50 feet ...

The new BinMaster® ToughSonic TC-100 and TC-200 non-contact ultrasonic sensors include ... distances up to 50 feet. These sensors are used for tank level measurement, remote monitoring, distance ...