... karaoke system on the marketing, inquiry software.3. support USB2.0,COM,PS2.4. Support WONDOWS5. Support to slidding, support to HDD ... by finger or any untransparant objects.15.Power Supply’s(4-5V), without external power supply16.Glass: 3MM Optical Glass, ... high sensitivity, fast response! 2. Strong hardware and perfect structure design. 3. Anti-glare, anti-dust, anti-static, anti-electromagnetic ...