About the size of a matchbox, these are the wireless transmitters that stream audio between any two devices with incomparable ease. Simply plug one device into your home entertainment center, television, computer, MP3 player, or any source with a 3.5mm audio jack. The other plugs into headphones or your stereo system (to play through its speakers). The devices enable you to listen to TV in bed without disturbing a spouse, or to roam freely while wearing headphones without being tethered to an MP3 player or stereo. CD-quality audio is transmitted up to 30' over the 2.4GHz band for interference-free listening. Each transmitter plugs into a USB port for charging and works for seven hours on a seven-hour charge. Includes one transmitter and one receiver, a pair of USB cables for charging, two pairs of audio cables (12" and 24"), two neck lanyards, and two belt clips. Each transmitter 2 1/2" L x 1 1/2" W x 1" D. (3 oz.)