Main Feature 1. It can combine with any lubricity and firm plane to form electronic whiteboard, convenience, agility, economy 2.ultrasonicinfrared wireless orientation technology, fit to write and painting big area and high density, it has high distinguish rate , quick answer speed and operate delicacy. 3.you can select the write area, the largest area can reach 1.5×2.0m. 4. it supply abundant teaching resource function 5. it adopt USB interface, plug and play, doesnt need out meet power Product List 1 receiver, 1 control box, 4 signal pens, 1 electronic eraser, 4 white Board pens with different color, 1 mouse pen, 1 data line, 1 common eraser, 10 button batteries(CR2032), 1 CD with PC software, 1 sit at the end of receiver, one volume of double-sided adhesive. Application It can be used in electricity teaching and remote teaching of junior college and technical secondary school, high school and grade school, network meeting, military explain, electronic commerce, electronic government affair, science study, work report, remote medical treatment, product unfurl meeting, train, hotel, cabaret and so on. Performance 1.the largest write range: 1.5m×2.0m 2.the track speed of system: more than 3m/s. 3. system distinguish rate: 0.1mm 4.system work temperature: 16 ∼ 5. the persist work time of signal pen: more than 80 hours (3V button batteries)