ok this is a terrible product. drowsy driving features somewhere at the bottom of the leading causes of road accidents. a quick google search will tell you that drunk driving, distraction, speeding, taking the wrong turns and may a total of 15 to 20 reasons, but drowsy driving, are the leading causes of road accidents.

if this is for taxi drivers, who do long shifts then in a situation during which the driver falls asleep, or is feeling drowsy and the passenger notices, be ready for a social media sh*tstorm. Since the device takes a minute to check is the driver is asleep or not, or even drowsy, one minute being enough for a mishap to happen, then in case an accident happens, the driver is likely to lose the job, and the worst, it will lead to a lawsuit and a small business will likely go out of business.

I think we already know the tool to avoid accidents due to drowsy driving, as is taught to everyone who takes a driving test - do not take the car out when you're sleepy. get some rest and then leave later.