Brand N/A Quantity 1 Color Black Material Plastic Interface USB Power Supply USB Features Myopia prevention alarm for computer Others With the development of network computer popularity many young people play more and more with wrong distance of line vision and posture so these problems will lead them to be myopic or unintentionally deepen the degree of myopia. Many parents are worried but they cannot do anything. Computer anti-myopia is the high-tech patent product built-in infrared sensor chip with language warning speaker. The product is set 50cm for the correct distance of line vision. When the distance between eyes and screen is less than 50cm the alarm will instantly speak: too close please please pay attention. Of course if the distance is more than 50cm the alarm will stop but it is still in monitor state. So the user's line vision is always placed with correct distance and then let you have a correct posture. Always keep using this product can help you to prevent myopia and relax fatigue for the eyes. Packing List 1 x Myopia prevention alarm (143cm-cable)