Features: Two people talk at the same time, can be connected to 6 machines, automatically answer cell phone calls. Specifications: Intercom wireless transmission range. 1200M Cell phone and machine connection distance: 10M Wireless solution. Bluetooth 5.1 Support Bluetooth protocol. a2dp, avrcp, hs/hf External interface. DC Standby time 300 hours Operating time: 20 hours Battery: 850MA Charging time: 2.5 hours Charging voltage: 5V Speaker diameter: 38MM Signal frequency range: 2.402GHZ-2.480GHZ Working temperature: -40~60â?? Product material. ABS/PVC plastic Product size: 101mm*54mm*20.5mm Accessories: base clip * 1, headphones * 1, soft label * 1, hard label * 1, charging cable * 1 Contact us via: lea@teleheer.com About Teleheer Teleheer is a brand of Shenzhen Hongfu Intelligent Technology., Ltd. We focuse on conventional electronic product development and design while promoting technological innovation, such as Bluetooth technology for helmets, ear wires, speakers, cars, etc. For over 14 years, We have worked with international companies to create product patents and attain R&D achievements with Intellectual Property Rights. Factory Teleheer's factory is built over a 6,000 sq. m. land area with an 800 sq. M. office, 5,000 sq. m. dormitory, 2,000 sq. m. open space, and 1,500 sq. m. SMD workshop. Research and Development and Design Proficiency We satisfy our OEM (Original Equipment Manufacturer) / ODM (Original Design Manufacturer) customers with top-quality products. Also, we have several patents invented for international and local products. Until now, Teleheer has received a lot of international certifications, such as BQB, CE, FCC, IC, REACH, ROHS, WEEE, and more. Operational Certification Teleheer has system certifications for quality management, environmental management, and safety management. Teleheer is the most qualified in the industry. We mainly do research and utilization of Bluetooth intercoms for motorcycles. We provide our customers directly with a Bluetooth intercom without the need for a middleman. We have a factory that is over 60,000 sq ft. We have a fully certified factory that undergoes regular inspection. We always meet our OEM and ODM customers' requirements for quality. We have international and domestic intellectual property rights as well as invention patents. We have several internal certifications.