Touch button design: Non-slip, fall protection, not easy to wear. touch button design, comfortable hand feeling | USB interface: USB interface, easy to install and use. Plug and play, no driver installation required | Easy to carry: Ultra-slim design, easy to carry. Can be easily placed in a briefcase or laptop bag | Facilitates data entry: Helps simplify entry of large amounts of data, facilitates data entry | Application: Suitable for all kinds of laptops, desktops, etc.