| The device must support the functionalities of an optical mouse. |
| The device must be compatible with multiple platforms. |
| Users must be able to hold the device in one hand. |
| The device must provide all sensor readings of a stylus. |
| No longer measuring the pressure and inclination |
| Pushing responsibility to the host device |
| Durability issues & sensitivity |
| The device battery life should last the duration of a meeting or lecture. |
| The connection between the device and computer is wireless. |
| The device application point should not inflict any scratches on a glass or wooden surface. |