• Smart Pen-XN680
• Technology:Ultrasound and Infrared
• Coverage area:A4
• Storage Temperature:-20℃ ~ +65℃
• Operating Temperature:5℃ ~ +35℃
• Operation Relative Humidity*：20% ~ 90%（40℃）
• Storage Relative Humidity*：20% ~ 93%（40℃）

product feature
1   Works with normal ink & Paper, keep you writing habits
2   Bluetooth low energy, Always on
3   Upload your handwriting notes to smart phone wirelessly and     share to Network easily
4   Extend your smart phone screen
5   New & cool input device in addition to mouse, keyboard and     touch Screen
6   Support to iOS & Android smart Phone