It's not too early to be thinking about the coming nicer weather in Spring and Summer -- getting outside on the patio, grilling with friends, and glad to not be cooped up in the house. At this time of year, I begin to think about what improvements I can make to my back yard; I've always wanted outdoor speakers, and now I am investigating wireless units to make the installation job easier.
I found some I like; for instance, these from Audiovox -- their Acoustic Research Wireless Speakers ($63; were $99). This weather-resistant speaker sports a trio of available broadcast frequencies and is compatible with your iPhone, iPod, or iPad. 5 watts RMS through a 2" tweeter and 3" woofer and crystal-clear reception out to a distance of 150 feet. Dual power modes -- ac or six (not included) batteries. The speaker is designed to sit on a hard surface or to hang from a deck roof support or a gazebo.
For high quality portability, this Logitech Wireless Boombox ($100; was $150) is perfect for the beach, picnics, or backyard cookouts -- use it with your iPhone, Pod, or Tablet or Android phones and tablets. It will pump out the sound, through its eight speakers, up to 30 feet from your music source, and you get about six hours of sound from the rechargeable batteries on-board. An ac adapter is included with the boombox; that will more than triple the battery RMS output of six watts to twenty watts. Nice.
Lastly, this Altec Lansing 900 iMw725 inMotion Wireless Speaker ($136; was $200) -- it will play your tunes up to (line of sight) 300 feet way from your computer, i-devices, or other stereo Bluetooth sources. The USB connection to your audio source streams your music via apt-X technology and a pair of 3" full-range, long-through drivers. The speaker set includes a remote and a 7 hour rechargeable Li battery.