Double Chill, Portable Bluetooth Speaker | 100 ft. Range, Waterproof, 12 Hour Playtime, Dust-Proof, Drop-Proof IP67 Rating | Built-in Speakerphone, Aux-In Port, USB Charging | JAM Audio Blue

The Double Chill is great on its own, but it’s twice as nice when paired with another speaker for stereo sound. Its rugged design and waterproof construction are ideal for a day in the sand, and the 30-meter/100-foot Bluetooth range and 12 hours of playtime mean no back-and-forth trips to the car.