Amazon Selling Electric -Shock Bracelet That Cures You of Bad Habits https://www.npr.org/sections/thetwo-way/2018/02/01/582370715/wrist-watching-amazon-patents-system-to-track-guide-employees-hands
The online retailer has acquired patents for wristbands using radio frequencies or ultrasonic pulses to identify exactly where a warehouse worker's hands are, and indicate if they need to move.
npr.org
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