Features: 1. Electromagnatic working and high precision DSP data processing principles.2. PET material, low light reflection, rub resistance & solvent resistance, good projecting effect.3.Human oriented design on software, easy to learn.4.Independent IPR, win several national awards, software keeps non-stop updating for free.5.Data transmission and power supply are both by USB cable only.6.Boundary useful functions: such as,camera, magnifier, auto-record & replay, intelligent recognition on hand writing and drawing, etc.Packing Specification:Board Diagonal (inch)Active Diagonal (inch)Active Writing Area(mm) ±5mmPacking Size(cm) ±2mmNet Weight(kg) ±1kgGross Weight(kg) ±2kg 77711456×1091166×132×12 16 25