The SENA 3S Plus Universal Microphone Kit uses Bluetooth 4.1 to deliver incoming and outgoing audio for music, phone calls, GPS directions, and intercom conversations with a passenger or a riding companion up to 400 meters (0.25 miles) away.Bluetooth 4.1Headset Profile (HSP) and Hands-Free Profile (HFP)Advanced Audio Distribution Profile (A2DP)Audio Video Remote Control Profile (AVRCP)Intercom up to 400m (0.25 miles) in open terrainSupports up to 2 ridersAdvanced Noise Control Built-in SBC CodecUp to 8 hours Talk time after 3 hours of chargingLithium Polymer BatteryCertificates - CE, FCC, ICThe SENA 3S Plus Universal Microphone Kit is simple, elegant, and powerful with everything you need and nothing you don t.The unified speaker construction of the 3S Plus Universal lends itself to simplicity and efficiency, and is able to be applied to a wide variety of helmets. This Kit has sleek external controls which are available for full or open-face helmets. The two-button control module attac