best free conference call service

{"cid":"91220330","title":"96 Inch Digital Touch Screen Conference Interactive Whiteboard, Support 10-Point Finger Touch","imgUrl":"https:\/\/img.chinax.com\/nimg\/2e\/05\/1b1825242843a137e9ebed830312-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"MTHGH","Model Number":"XYC-96","Minimum Order Quantity":"1 Set","Delivery Time":"7-10 Work Days","Place of Origin":"China","Certification":"CE FCC ROHS ISO14001 ISO45001 ISO9001","Packaging Details":"Standard carton package : carton+ plastic bag+ foam+ honeycomb paperboard+ pack thread.","Payment Terms":"L\/C, T\/T, Western Union","Supply Ability":"10000 Piece","Product Name":"96\" conference Interactive Board\/ Whiteboard\/ IR White Board 83 86 96 106 120 130 150 Inch Customized Whiteboard\/ Smart White Board","Size":"83,86,96,106,120,130,150 Inches","Cursor Speed":"180 Points\/second","Touch Points":"20 Points","Zoom":"16:9","Type":"Interactive Whiteboard","place":"School, Supermarket, Conference","Touch resolution":"32768*32768","Touch body":"Finger, Writing Pen Or Other Non-transparent Objects","Response time":"Single Point <6ms. Double Point <10ms","Interface":"USB, VGA, RS232, HDMI","Power Supply":"AC 100-240V, 50\/60Hz","Accuracy":"2mm","Colors":"Black Or OEM","Operation System":"Andriod\/Windows\/Linux\/Mac.etc.","Hotkeys":"Two Sides Hotkeys","Mobile Stand":"Optional","Operation":"Temperature: -10\u00b0C~45\u00b0C Humidity: 10%~90%","Application":"School Teaching,education,Classroom Education For School,business,presentation"}}

{"cid":"91199486","title":"102 Inch Interactive Whiteboard Projector Screen Board For School Conference","imgUrl":"https:\/\/img.chinax.com\/nimg\/65\/0a\/a94943f78ef354a097db1a1c80a6-200x200-1.jpg","attrs":{"Brand Name":"iBoard or OEM","Minimum Order Quantity":"10","Delivery Time":"30 days","Surface":"Nano or Ceramic (Optional)","Installation":"Wall mounted, cabinets, mobile stand (optional)","Color":"Silver, Grey, Black, Grey (Other colors optional )","Application":"Education, School, Business, Presentation...","Certification":"CCC, CE, FCC, RoHS, Reach, OHSAS, ISO9001, ISO14001","Size":"102\" 82\/86\/90\/96\/120inch available","Ratio":"16:9\/ 16:10\/ 4:3","Warranty":"1 year","Place of Origin":"Shenzhen, CHINA","Packaging Details":"Carton Package","Payment Terms":"T\/T, L\/C","Supply Ability":"10000 units per month","Aspect Radio":"16:10, 16:9...","Interface":"USB, VGA, RS232, HDMI","Screen Size":"65\",75\",86\", 98\"","Multi-Touch":"Up to 40 points","Hotkeys":"Two sides hotkeys","Shipping Way":"Sea Shipping Air Freight Truck Freight","Touch Points":"20 points","Power Supply":"AC 100-240V, 50\/60Hz","Operation System":"Andriod\/Windows\/Linux\/Mac.etc.","Accuracy":"2mm","Mobile Stand":"Optional","Colors":"Black Or OEM"}}