Review on 🔊 Vibe Speaker Tumbler: 18oz Stainless Steel Tumbler with Bluetooth Speaker - 8 Hours Playback, IPX67 Water Resistant - Perfect for Beach, Camping, Golf by Jeff Wieczorek

This mug is such a cool 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 that sealed in the cup. 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.