Amazon has been granted two patents for a smart wristband that can track the hand movements of warehouse employees as they work in real time.

According to the patents, the wristband emits periodic, ultrasonic sound pulses which are picked up by receivers placed around a warehouse and are then able to track worker hand movement in relation to inventory tasks.

A second patent for haptic feedback inside the wristband will vibrate to alert the wearer should it detect they're about to inventory an item into the wrong place, or pick up a wrong item.

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