Nanjing Yudi Science&Technology Development Co.,Ltd is a professional and qualified  manufacturer of visual presenter ,overhead projector and other educational instruments for many years in Nanjing ,China .
We would like to offer you with the best price and service to build long-term business cooperation with you , or to be your stable supplier .
If you have any interest or need any further information, pls feel free to contact me .
I will reply you in details along with the pictures ,specifications&feature ,and prices .
Your any idea will be welcome .