Motorola S7HD Stereo Bluetooth Headset Motorola S7-HD Stereo Bluetooth Headset. Bluetooth headset High Definition Audio: SRS WOW HD technology delivers 3-D surround sound and high-definition The Motorola S7-HD Stereo Headset is now enhanced with high definition audio and improved bass for a rich music listening experience. Weighing only 1.6 ounce: The Motorola S7-HD is lighter than an average pair of sunglasses!