This mug is a great idea and the speaker sounds pretty good considering it's attached to the bottom of the mug, but the mug I received has a loose piece of metal stuck in the inside the cup is sealed. Every time I pick up a cup and tilt it to drink, you can hear the metal sliding inside, which is REALLY annoying given that it's absolutely impossible to get it out. When you shake the cup, it looks like a rattle.
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