To use this kind of digital pens you just need bluetooth and the surface which can be used to write on. To display the message and other information this digital pens are using OLED screen.
Main attraction of digital pens are they will save every thing which you will write and on you can transfer such details to your computer as well.
If your home appliances are bluetooth enabled than you can program digital pens to give them command by writing on air only.
Designer : Reuben Png