The case, which can only be removed with a specific screwdriver, allows parents to set time restrictions on their child’s smartphone usage via an accompanying app.
Motion detectors built into the case – called OTOMOS – also deactivate the phone automatically when the child is walking, to prevent them from checking the devices while on the move.
Japanese parents will be able to buy the device from mobile phone shops in August, with a two-year contract including the case and application fee costing around £3.50 (500 yen) a month.
“We have developed the product after hearing many views and concerns of parents who have children using smartphones,” Masato Otsu, president of Momo Ltd, told Kyodo news agency.
“All you have to do is just attach the case, so it is very easy to use.”
An increasing number of global companies are creating applications and software to help parents limit and manage their children’s internet access. One such app alerts parents to inappropriate pictures and selfies being sent or received on the device.
The new device in Japan taps into concerns among parents in relation to not only the health impact but also the potential dangers of their children overusing their mobile phones.
New figures published last week by Japan’s National Police agency showed that a record number of Japanese children were becoming victims of crimes such as molestation through the use of social media.
A total of 1,736 children under 18 were victimised last year – double the number in 2008 when records began – with more than 86 per cent falling victim via their smartphones, many of whom had unrestricted internet access.
Last year, there were also reports in South Korea that excessive use of smartphones by children was causing them to become cross-eyed.