Panel Features
Panel Dimensions:70 "panel 4K, 75" panel 4K, 86 "panel 4K 16: 9
Panel type: TFT LCD (Direct LED Backlight)
Resolution: 4K UHD (3840 x 2160 @ 60 Hz)
Response time: 8ms
LED panel life: 50,000 hours
View angle: 178 degrees
Brightness: 70 "4K: 350 cd / m2, 75" 4K: 350 cd / m2, 86 "4K: 400 cd / m2
Front glass: Toughened tempered, non-glare

System features
Operating system: Android? Oreo 8
RAM: 4 GB, Internal memory: 64 GB (32 GB x2)
Processor: Quad Core: (2) ARM Cortex A73, (2) ARM CPU
Graphics processor: Cortex A53 GPU

Sound Features
Dual front Speakers with enhanced bass tones
70 '' 4K: 2x15 Watts
75 "4K: 2x15 Watts
86 "4K: 2x20 Watts

Touching and using specs
Touch Technology: Vellum Writing Technology
Continuous Touch Points: 20 poinst
Touch Resolution: 32768 x 32768 px
Response Time: <=5 ms
Touch Accuracy: 1 mm
Tracking Rate: 6 m/s
Scan Rate: 200 Hz
Eraser Included (block eraser): 1
Pens Included: 4 with Rear Erasing Feature
Pen Type: Battery-less Pen
Pen Holder: Integrated Full-length Pen Tray
Pen Tip Diameter: 3 mm
Pen and Touch Differentiation: Yes
Pen Identities: 2
Palm Detection: Yes
Classroom Essential Apps: Including Whiteboard, Annotate, Timer, Spinner, Screen Capture, ActivCast, Screen Share, Browser, PDF Reader, Media Players
Compatibility: Windows® 7 to 10; OS X® 10.8 to 10.11 macOS® Sierra 10.12.1 or later; Linux® Ubuntu® 18.04 LTS; Chrome OS