Stylish, comfortable and engineered with cutting-edge Bluetooth wireless technology, the Motorola MotoROKR S9-HD Bluetooth stereo headphones help provide wireless access to music and voice calls - while on the go. High Definition SRS surround sound audio and noise isolating ear buds immerse you in a rich music listening experience. Compatible with Bluetooth-enabled stereo music players including cellular phones and iPod players. Behind-the-head wearing style, preferred for top comfort and stability, combines with music and call selection from the headphones. The Motorola S9-HD is perfect for delivering favorite tunes and connecting you to calls wirelessly with a lightweight design -- control tracks and volume wirelessly. Weighing barely an ounce, the Motorola S9-HD is lighter than an average pair of sunglasses! The behind-the-head form and small ear buds help provide true comfort – even during extended use. Water and sweat resistant, the Motorola S9-HD is the ideal wireless headwear for the active music lover. Now, be connected and listen to favorite songs during those tough workouts, without getting tangled in wires. Up to six hours of play from a single charge. Music mutes or pauses when calls come in and resumes once the call has ended. Supports Bluetooth Advanced Audio Distribution (A2DP), Audio Video Remote Control (AVRCP), Hands-free (HFP), and Headset profiles. Phones that do not support A2DP will produce mono sound in the S9-HD Headphones rather than stereo sound.