http://www.qyresearchglobal.com/goods-891759.html
According to QYR study, the Global revenue of Speech Generating Devices was valued at 148.46 M USD in 2015, and is forecast to reach 253.54 M USD by the end of 2021. Tobii Dynavox accounted for 45.689% of the global Speech Generating Devices revenue market share in 2015.