... for sale for school 1,dual touch 2,optical imaging. 3,support windows 7,windows8. Optical imaging Hitouch 80"/86"/92 ... accuracy: 32767*32767.2,no pressure and no special pen needed.3,powed by USB4,multi touch under win75,lift time:7years ... hardware and perfect structure design, one-time installation, no drift.3. Best adaptability on crash-proof, scratch-proof, water-proof, dust ...