multi microphone conference system 4 channels

{"cid":"91171055","title":"Wireless Conference Microphone , Professional Audio Technica Conference Mic","imgUrl":"https:\/\/img.chinax.com\/nimg\/c3\/41\/6dbbe212a25f0a95972fd2b75e0a-200x200-1.jpg","attrs":{"Price":"negotiable","Brand Name":"Boente","Model Number":"BNT780U","Minimum Order Quantity":"50units","Delivery Time":"10-15 days","Certification":"CE\/ROHS\/FCC","Place of Origin":"China","Payment Terms":"L\/C, T\/T, Western Union","Supply Ability":"1000 units per month","Packaging Details":"carton","Product Name":"wireless microphone","Color":"Black","Style":"2 Channels wireless microphone","Working frequency":"640-690MHz","Modulation":"Broadband FM","Number of channels":"100","Channel interval":"250kHz","Frequency stability":"\u00b1 0.005%","Dynamic range":"100dB","Maximum offset":"\u00b1 45kHz","Working distance":"60m"}}

{"cid":"91225131","title":"Wide Angle USB 4K Conference Webcam with Dual Noise Reduction Microphones","imgUrl":"https:\/\/img.chinax.com\/nimg\/2e\/94\/22e803609ffe44fa55fa332c04e2-200x200-1.jpg","attrs":{"Price":"USD 33.24~33.49 \/ pieces","Brand Name":"Xingzengcai","Model Number":"913 Ultra","Minimum Order Quantity":"2000 pieces","Delivery Time":"30-45 working days","Model":"913 Ultra","Field of View":"88\u00b0","Audio Feature":"Dual Stereo Noise Reduction MIC","Focus Type":"Manual Focus","Supply Ability":"100000piece\/Month","Lens Aperture":"F\/2.2","Place of Origin":"China","Packaging Details":"Neutral\/Customized Color Box","Resolution":"4K@30fps, 1080P@60fps","USB Interface":"USB 3.1 Gen1","Certification":"CE,RoHS,FCC","Frame Rate":"30fps (4K), 60fps (1080P)","Maximum Current":"520mA","Payment Terms":"L\/C,T\/T","Storage Temperature":"-30\u201385\u00b0C"}}