Sena 3S Plus Bluetooth Headset - Universal Mic Sena is pleased to introduce the 3Splus-Wb with a wired boom microphone kit. Features Bluetooth 4.1 Two-way Intercom Working distance: up to 400m(HD) (0.24 mil) in open terrain Up to 8 hours talk time Wired Boom Microphone: length 120mm ( 4.72) / Wired Microphone: length 180 mm (7.1) Micro USB charging cable 11 languages (switching the firmware with each language) Mobile App Not supported Speaker Driver Unit: 23 mm - thickness 4.3 mm