the way to connect speaker

A smartphone can play music through its built-in speakers, but it'll be useless if you want to throw a party, listen to your favourite songs in the garden or even in the shower. Bluetooth speakers provide a much-needed upgrade. They're easy to pair with any Bluetooth-enabled device, such as your smartphone.
Portable, indoor, waterproof and budget Bluetooth speakers
So no matter if you're on Android or iOS, you can drastically improve your listening experience with one wirelessly connected speaker.