This will depend on what type of Motorola portable radio you are using. Check the product description thoroughly before using it near water. If it is not waterproof, there are cases and bags that you can purchase for it that will make it waterproof.
Amazon can provide you many choices in which brand to purchase when it comes to portable speakers for mp3 players. The best portable speaker you can purchase is the iLuv iSP100BLK Mini Portable Speaker for MP3 Players. It comes in different colors.
You can buy a portable USB speaker online from the online stores of Walmart, Target, Amazon, Ebay.http://www.walmart.com/ip/Kinyo-Portable-Audio-Bar-Portable-PC-Cooling-Fan-BP-301/14138895. http://www.target.com/s?keywords=portable+usb+speaker&searchNodeID=1038576|1287991011&ref=sr_bx_1_1&x=0&y=0
There are a few websites where someone can purchase a Logitech mm50 Portable Speaker. Some examples of websites are Overstock, Apple, eBay, and Amazon.
Electronic stores like Best Buy, Fry's or mass retail stores like Walmart and Target have portable speaker for an iPod for whoever is looking to buy one.
Some portable cassette players are waterproof. The fully submersible Swimman works to ten feet and operates on 2 AA batteries.
It depends on the environment, a 2 watt speaker is usually smaller and more portable but a 12.5 watt speaker is louder and usually has better sound quality.
Aiwa makes a water resistant portable cd player that should keep it running even if splashed.
Nothing is better.
Outdoor speakers should be at least water repellent. Most are not waterproof however. Air needs to be able to be able to circulate in and out of the speaker to create the accurate vibrations to create sound so having them waterproof is very difficult.
The price range of portable MP3 speakers are from as low as $10 to over $200 depending on the type you are looking for. According to Nextag.com, in order to get a decent speaker, you should be willing to spend between $20 to $30 for one. http://www.nextag.com/mp3-portable-speaker/stores-html
The Genius SP-i200U, 2W is a great portable laptop speaker system.