Review on 🔊 18oz Stainless Steel Vibe Speaker Tumbler with Bluetooth Speaker | Upgraded 1000MaH Battery | Up to 8 Hours Playback Time | IPX67 Water Resistant | Ideal for Beach, Camping, Golf, and More by Russ Mashlan

This jar is such a cool idea and the speaker sounds pretty good considering it's attached to the bottom of the jar, but the jar I received has a loose piece of metal going in 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.