Champion CWP-SPK-BLK Champion Wireless Portable Dual Stereo Speakers with Zipper Pocket and Clip for 3.5mm Ported Devices- Black-Speakers-Retail Packaging-Black Champion Wireless Products portable speaker and case is perfect for smartphones, cell phones, MP3 Players, laptops, and other 3.5mm ported devices 3.5mm ported devices can connect simply to the speakers via an included standard 3.5mm input cable. Each speaker measures in at 1.25 inches, included hanger clip lets you clip and go on to a golf bag, backpack, belt loop and more. Champion Wireless Products portable speaker plays music loud and clear with extended depth and clarity in high quality stereo sound Champion Wireless Products portable speaker requires two AA batteries (not included).