• Ultra-narrow bezel and all-in-one design integrating speaker and 75-inch 4K DLED backlit touch display. • Enable fluent writing on whiteboard; provide touch operations such as erasure, resizing, and roaming and multiple erasure modes such as point erasure, circle erasure, touch erasure, and one-tap screen clearance. • Scan the QR code for sharing writing records and annotations. • One-tap wireless projection on computer, mobile phone, and tablet without wire connection. • Simultaneous multi-image displays on multiple wireless projectors;provide reverse operation of projection content. • Optional ultra-thin pluggable PC module and I5/I7 CPU.