UE Boom 2 can be paired with any other Ultimate Ears speaker using UE Boom 2 app for Android and iOS. (indianexpress.com)
PartyUp from Ultimate Ears lets you connect wirelessly to up to 150 + Ultimate Ears speakers using the Ultimate Ears app ***, so you can take your parties where no other sound system can go. (amazon.com)
You still get the metal - bar ear speaker at the top of the phone, but for media playback you get a couple of cheap - looking speakers along the bottom of the device. (techradar.com)