LOYAL CUSTOMER BENEFIT PLAN We are very grateful to every customer who recognizes our products and look forward to hearing from you and briefly describing your actual trial situation. TROUBLESHOOTING GUIDE 1.No Sound “Turn Derby audio off In your device. * External speaker is required for VGA cable connection. 2. Blurry Image * adjust focus ring keystone, a Please pick up your phone and record your own mini video, then share it with * Projector and screwball must be in effective distance.