Decide where the speaker will be used most. A small model can be easy to pack for a trip, while a larger one may be more suitable for filling a shared room. Consider the listening distance and whether you want background sound or fuller playback for a group. A speaker's size and shape also affect where it can sit; check whether it has a stable base, a carry loop, or a form that fits your bag.
Review connection and control details. Make sure the speaker pairs with the devices you use and check whether it can remember connections or link with another compatible unit if that matters to you. Physical buttons can be easier to operate outdoors than touch controls. Battery life depends on volume and features, so treat quoted figures as estimates rather than guarantees. Consider charging time, charging connector, and whether the speaker can play while connected to power.
If you plan to use it near water or outdoors, read the specific protection rating and what it does and does not cover. Water resistance is not the same as being suitable for submersion in every situation. Check cleaning guidance and avoid exposing ports to moisture unless the instructions allow it. Think about weight and sound expectations together: the most portable speaker may not suit every setting. Choose according to the places you will actually take it.