I have two sets of two Centrios 900MHz Indoor/Outdoor Wireless Speakers. Each set comes complete with their own wifi sender and remote controls. I have been using them as one big set of four speakers, scattered around the house. They work very nicely off of any audio device. They have a range of about 150 feet, and the rear channel amplifiers give you a nice clear deep sound.
The speakers are indoor/outdoor units, and can operate on C batteries, or plug into 110. About two years old, but never abused. Grandpa is getting ready to move, and just does not use them any more.
Will sell each set for $30, or both for $50