Users breathe into a test hole in the case and readings pop up on a display seconds later.
Hiroyasu Yamamitsu, boss of Japanese firm Thanko which created the device, said: ‘After drinking alcohol it’s difficult to know whether people can drive a car or not.
‘People need to check if they’re safe to drive and there’s nothing more convenient than having one built in to your phone’s case.’
However, the case should not be used as a standalone device to determine a safe driving limit, the firm warned.
To get a blood alcohol reading from the Japanese
Alcohol Checker case, pictured, users blow onto the test hole on the
back of the case for up to five seconds. After 20 seconds, the reading,
measured in grams per litre appears on a small display, shown as a
percentage
The display will also light up red, pictured
left, or green, pictured right, to warn people if they're over the
driving limit, or it is safe to get in the car. When the screen glows
yellow, users are borderline over the limit and should stop drinking and
wait a while before checking the reading again, and getting in the car
THE PHONE CASE THAT CAN BE CHARGED BY HAND
Illinois-based Mipwr Dynamo cases connect to an iPhone's battery charging point and contain a hidden push lever that when squeezed creates an electrical charge.
The electricity is created by electromagnetic conduction inside the case and a minute of squeezing produces around 30 seconds of charge.
The device works once users have blown into the case for three to five seconds.
After 20 seconds the reading is displayed as a percentage on the back of the case.
The display also lights up red, yellow or green to warn people if they’re over the safe driving limit.
If the screen glows red, it means it is not safe to drive, while a green screen means driving will be within the legal limit.
When the screen glows yellow, users are bordering on being over the limit and should stop drinking and wait a while before checking the reading again, Thanko explained.
To enable the breathalyser, the user can click the Check Alcohol button on the app.
The Alcohol Checker case also charges a phone using a built-in 1,800 mAh battery.
The case works in the same way as a docking station and users can switch between using the phone's battery, to using the power in the case.
The breathalyser is powered completely by the case, too, meaning it doesn't use up the handset's battery life.
It weighs 72 grams and is 15mm thick.
The current model has been designed to fit the iPhone 5, but the firm is working on versions for other phones.
The Alcohol Checker case also charges a phone
using a built-in 1,800 mAh battery. The case works in the same way as a
docking station and users can switch between using the phone's battery,
to using the power in the case. The breathalyser is powered completely
by the case
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