As the driver''''s head nods below a preset angle, it emits a loud alarm signal alerting the driver to take corrective action, i.e. change driver, take a break, or even take a nap. The nap zapper is not only designed for drivers, its perfect for people who need to be on full alert while on duty such as security guards, machine operators and even students who need to work on their postures. Makes a perfect gift.
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