The form factor is a vital design component to consider when you want to choose a speaker to buy. The form factor of the speaker determines their portability and usage. The wireless Bluetooth speakers come in two types of sizes. One is the ultra-portable mini speaker that can easily fit in bags and pockets of coats, and the second is the semi-portable speaker size of a breadbox. Before choosing the speaker, you should check other information related to the speaker to get the best quality speaker.