Enjoy your favorite tunes while working out with the Sony MDRAS20J Sport Headphones. The earbuds go right in the ears, while the ear hooks comfortably slide over the top and around the ears. These soft loop hangers keep the headphones in place, even during vigorous exercise. The loops of the Sony MDR-AS20J earbud accessories are made from silicone. If you wear them while outdoors, they fit with your armband, sunglasses, or hat. The hooks accommodate ears of all sizes, from children to adults. The hangers will not wrinkle, change color, or bend even when exposed to heat and UV radiation. The in-ear piece of these portable earphones is protected against corrosion. These in-ear audio accessories can even be used in a sauna with no warping.The headphones also include a detachable clip that you can use to keep the cable out of your way, whether you are running or chilling with some music. The Sony MDR-AS20J cable measures 48 inches long, which gives you enough length to connect the active style headphones to any device. They connect to the standard 3.5 mm headphone jack on both Mac and Windows computers. The helpful 90-degree connection for the electronics and speakers keeps them securely in place. These sporty headphones have a mini-phone stereo 3.5 mm stainless steel connector for your Apple iPod, iPad, or iPhone. You can also use them with your Blackberry, Android, or Samsung smartphone. These Sony MDR-AS20J headphones have a 10 Hz frequency response. Their drivers measure 13.5 mm, which delivers an acoustically accurate tone through the dome-shaped structure. These Sony devices make use of powerful neodymium magnets, which optimize their sound efficiency. The sound quality is excellent, and you can hear across five octaves when listening to vocal harmonies. If you are playing a bass-heavy track, the deep notes will not get lost. This black headphone model allows you to control the volume from the device where the music is stored. You can use them along with a mic if you want to wear them during calls.They have stereo sound output mode that allows you to listen to all of the rich undertones in your favorite songs. Since the speaker sits inside of your ear, every note is perfectly clear. These Sony accessories have an impedance of 70 ohms. Their sensitivity is 102 dB per mW, which means that you can hear even the softest of sounds in each song. Their power handling capacity is rated at 1,500 mW.With a weight of only 0.5 ounces, these portable Sony audio accessories are easy to slip into your pocket while traveling. These mobile Sony headphones measure just 5.2 inches long by 1.7 inches thick by 8.2 inches wide, and they fold for easy storage. You can store them in the case of your choice when they are not in use. If you lead an active lifestyle, these comfortable Sony headphones would be a great option since they work well in all types of weather conditions.