OBT-820 Wireless Meeting System Conference Microphone for Meeting Room Live Speaker   Wireless meeting system OBT-820 Operating range under typical conditions: 40 m (120 ft) Note: The actual range is related to the reception, reflection and interference of the RF signal. Audio frequency response (+/-3 dB) 80Hz to 16KHz Total harmonic distortion (+/-30KHz offset, 1KHz audio) <1% Dynamic range: >A weighted 90 dB Operating temperature range: -10℃ to +50℃ Note: Battery characteristics may affect this range limit Wireless conference microphone Maximum audio input level: 0dBV Size: 85 mm high X65 mm wide X23 mm thick Weight: 85g (without battery) Power supply: 2 "AA" type alkaline or rechargeable batteries Battery life: >8 hours (alkaline) receiver Audio output frequency (reference +/ -30khz,1KHz) XLR connector (access 600 Ohms load) : -12DBV 1/4-inch connector (access 3000 EURO load) : -18DBV Output impedance: XLR connector: 200 Ohms. 1/4 inch connector: 1, 000 ohms Sensitivity :(if demodulation output signal to noise ratio of 30dB) < -92dbm Mirror frequency suppression: >80dB Size: 44 mm high X212 mm wide X280 mm thick Weight: 3500g Power supply: 220 V DC, supplied by external power supply   Shenzhen OBTPA Technology Co., Ltd(www.obtsys.com) is a company which integrates research & development, manufacture and sales. It stands out of the high-tech industry realm of public address system among other competitors. Our company has been always adhering to the business philosophy of continuous innovation and creating value from customers since 1999 when the company established, hence a various of products has been successfully used in the big famous events such as the Olympic Games, World Expo, Asian Games, etc. these achievements make us gain a various of patents and establish a good brand image in the industry. All products have assed CE, FCC certificates, and the “OBT” brand trademark has been registered in the European Union, the United States and Japan. Our company has always focused on the innovative development of audio and video applications. Its products cover analog PA system, digital PA system, SIP video PA system, POE network audio speaker, professional audio speaker, paperless conferences, video conferences and other products, after more than 20 years of development, we have independent research and development, production and application design capabilities, can well solve the compatibility, reliability and advanced issues of communication, emergency, command and other issues. Products are widely used in the safe cities, smart parks, smart campuses, smart hospitals, and smart stations and other fields, successfully established a good brand image—OBT. We are committed to developing into a world-class video integration PA system manufacturer.