The M187 Wireless Ultra Portable Mouse from Logitech is a compact mouse with 2.4 GHz wireless connectivity thanks to its included nano receiver. Thanks to its extra-small design, it can be easily stored in your bag or even your pocket, so you can take it with you on-the-go. Additionally, its receiver is also small enough that you can leave it plugged into your system without worrying of losing or breaking it. The M187 mouse utilizes a single AAA battery, which can last up to six months depending on use.