http://selectoguru.com/us/the-best-portable-bluetooth-speaker/
http://www.t3.com/news/best-bluetooth-speaker
Why So Many Wireless Speakers Suck -- But the Deepblue2 Does Not
http://www.consumerreports.org/products/wireless-speaker/ratings-overview/
UE BOOM 2 GreenMachine Wireless Mobile Bluetooth Speaker (Waterproof and Shockproof)
Denon: https://www.amazon.com/dp/B01CTUJQL2?psc=1
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altec-lansing-mini-life-jacket-3 [6.5 X 2.5 X 2] $49
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sony-xb2 [7.5 X 2.6 X 2.4] SRSXB2/BLUE $49
http://www.bestbuy.com/site/sony-xb2-portable-wireless-speaker-blue/4836808.p?skuId=4836808
http://www.bestbuy.com/site/sony-x11-ultraportable-bluetooth-speaker-blue/6604143.p?skuId=6604143
Harman Kardon - One Portable Bluetooth Speaker - Black $79
Silver Label - Portable Bluetooth Speaker - Black
JBL - Flip 3 Portable Bluetooth Speaker - Blue
JBL - Flip 3 Portable Bluetooth Speaker - Teal
IP67 rating means this is considered dustproof and waterproof; it can withstand submersion in water up to 1 m deep for up to 30 min.
Altec Lansing Mini H2O - Waterproof Bluetooth Speaker
$20
Floats
6 hours
2 x 2 x 10 inches
5.9 ounces
IP67
JBL Clip 4 Speaker
$60
5.3 x 3.4 x 1.8 inches
8.4 ounces
10 hrs
IP67
JBL Clip 3
2.17 x 4.33 x 4.3 inches
7.8 ounces
10 hrs
waterproof
JBL Flip 6 Speaker
7 x 2.8 x 2.6 inches
1 lb. 3.4 oz.
IP67
JBL GO2 - Waterproof Ultra-Portable Bluetooth Speaker
$26
1.3 x 3.4 x 2.8 inches
6.6 ounces
5 hrs
JBL Go 3 Portable Bluetooth Wireless Speaker
6.06 x 4.37 x 2.8 inches
11.3 ounces
5 hrs