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The Fitbit Classic was a small black and teal device that could be clipped and worn 24/7. It uses a three-dimensional accelerometer to sense user movement. The Tracker measures steps taken as well as user data to calculate distance walked, calories burned, floors climbed, and activity duration and intensity.
$180 $265 at QVC. Comfortable to wear. The Fitbit Versa 3 comes with two included wristbands: a small size which fits wrists 5.5” to 7.1” in circumference, and a large which fits wrists 7.1 ...
This Fitbit Versa 2 deal comes with a black band plus an extra band in Navy if you're a size small. If you're opting for a size large, your extra brand color options are either Rose or Olive.
A small 2015 study had participants wear multiple devices on their wrists and hips while performing different walking/running speeds on a treadmill. Fitbit devices that are worn on the hip accurately measured steps taken within 1 step of 100% accuracy. Devices were worn on the wrist, however, were off by an average of 11 steps per minute.
Due to the varied definitions of wearable and computer, the first wearable computer could be as early as the first abacus on a necklace, a 16th-century abacus ring, a wristwatch and 'finger-watch' owned by Queen Elizabeth I of England, or the covert timing devices hidden in shoes to cheat at roulette by Thorp and Shannon in the 1960s and 1970s.
The first digital watch was the Pulsar, introduced by the Hamilton Watch Company in 1972. The "Pulsar" became a brand name, and would later be acquired by Seiko in 1978. In 1982, a Pulsar watch (NL C01) was released which could store 24 digits, likely making it the first watch with user-programmable memory, or the first "memorybank" watch.