Ultrasound whiteboard can works on a variety of surfaces - an existing whiteboard, a flat wall, even a chalkboard with dry-eraser paint, transforms those surface into an Interactive Whiteboard. No battery is required for USB signal receiver. It include Whiteboard*1. Electronic Pen*2 (ordinary AAA battery, interchangeable), USB Cable
Suitable Size: More than 82 Inch(Diagonal Size)
Resolution: 9600*9600
Response Speed: >3M/S (The highest speed)
Power: USB Power Supply, NO need extra power supply
Power Consume: <0.5Watt
Precision: 0.03mm

Pen: 2 PCS Ultrasound Pen, this pen can total replace mouse to operate with left click, right click function as well as selection or stop while dragging on the whiteboard surface.
with Pen Tray/Holder