21.5" USB 2.0 IR Widescreen Touchscreen Add-On LCD Frame w/Stylus - Add Touch Support to Your Monitor! 21.5-inch USB 2.0 IR Widescreen Touchscreen Add-On LCD Frame General Features: Black color Infrared Widescreen Touchscreen USB 2.0 interface Works with 21.5-inch LCD displays Multi-touch mode Supports zoom in/out, display rotation 16:9 aspect ratio 4096 x 4096 resolution 16 ms touch response time Non minimum activation force 2 mm position accuracy 120 dot/sec cursor speed