The SRF-MQ11SILVER is a big innovation in Walkman headphone design. It features individual left and right behind-the-ear caps, which clip onto the ears, leaving your hair muss-free. The features are all packed into the small headphone caps; it has an FM stereo digital tuner, 15 station presets, Mega Bass Sound System, and a built-in rechargeable battery. An AC adaptor is included, so recharging your battery is super simple. And, it won't weigh down your head, because the entire unit (including batteries) is only 2.65 ounces. Small. Innovative. Powerful. SRF-MQ11SILVER.