Longsight Technology Co. Ltd. is composed by a team of high educated and experienced optics, electrics and managing people, engaging in the development and sales of projection and display equipment. Our products cover projector TV, projection screen, and projection lamp. Especially, the projection screen contained motorized screens, auto fixed wall screens, tripod screens, frame projection screens, portable table screens, portable floor screens and motorized window curtains, totally 7 series and up to thousands of models. Of course, OEM and ODM services are available. Moreover, we also have a new factory which manufacture headphone. The product are widely applied to MP3, MP4 players, computers, cell phones, game consoles and so on�including stereo earphones, c omputer headphones, 100MHz wireless headphones, 863MHz wireless headphones, Bluetooth headphones USB headphones.