In comparison with desktop mice, notebook mice are usually smaller, as they are designed to navigate smaller tabletops or desk areas, and for portability.
Travel mice are very similar to notebook mice in that they are designed for portability. For many, the terms are interchangeable. For travel mice, the things to focus on are convenience and mobility.
Laser mice track movement via a laser reflected off the work surface. They have a standard tracking sensitivity of 2,000 dots per inch, and work on most flat surfaces.