This is my favorite Itty bitty Bluetooth speaker

This 3-ounce Bluetooth speaker is highly rated on Amazon (and Fakespot gives the reviews an A grade for authenticity). It also comes with a built in mic so you can use it as a speakerphone. We bought one in March and my daughter uses it much more than than the larger one she has. It is loud and clear, even at top volume. It's only $10.79 when you click the coupon checkbox.