UE Boom 2

via Ultimateears.com

We have highlighted the UE Boom before, mostly because we can't recommend them highly enough. This indoor/outdoor speaker can take a massive beating, and keep on pumping out the beats. Waterproof in 1 m of water for up to 30 mins, this party starter can be left out in the rain, have drinks spilled on it, and take a windy day on the beach in stride. If you are planing on being outside, and jamming is on the agenda, the UE Boom is the way to go, hands down. What is even cooler is that you can pair up to 50 of these tubular audio blasters together, so you can pipe the party music throughout what ever beach, mountain, or lake house you are occupying during your vacation.

Available on UltimateEars.com for $100

Full Disclaimer: By clicking "Buy" and purchasing an item from this retailer, we here at What is A Gentleman will not receive a commission but these are too good not to recommend.