55/65/75/100 inch multimedia teaching conference all-in-one educational tablet electronic whiteboard touch monitor55" 65" 75" 100" All in one teaching conference machine All in one teaching conference machine is used for intelligent all in one machine, electronic whiteboard, remote conference. It can be multi touch, intelligent annotation, wireless screen, scan and save, anti fingerprint screen, multi screen interaction, 4K high definition screen, dual system switching. Integrate six major functions Multi use, build diversified intelligent office, integrating