teaching board with 1200 1 contrast ratio

{"cid":"91217804","title":"High Contrast Ratio Interactive Teaching Board with 178\u00b0 Viewing Angle and 1200 1 Contrast Ratio","imgUrl":"https:\/\/img.chinax.com\/nimg\/4b\/ec\/0f3a0bf78d0346c7ca787e91c07e-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"TSINGHILL","Model Number":"T55","Minimum Order Quantity":"5 Unit","Delivery Time":"5-30 days","Place of Origin":"Guangdong, China","Certification":"CE, CNAS, FCC, CCC","Packaging Details":"Honeycomb Box","Payment Terms":"TT\/West Union","Supply Ability":"50,000 units per month","Software":"All Windows Software Can Be Used ","Contrast Ratio":"1200:1","Color":"Black Or OEM","Connectivity":"Wi-Fi, Bluetooth, Etc.","Inputs":"VGA, HDMI, USB, Etc.","Brightness":"350cd\/\u33a1","Resolution":"1920*1080","Product Name":"Interactive Digital Blackboard"}}

{"cid":"91225197","title":"Silver Gray 75 Inch Smart Multimedia All-In-One Conference Teaching Machine New Model Infrared Touch Interactive Board for","imgUrl":"https:\/\/img.chinax.com\/nimg\/59\/a6\/90db2a85f4ff3bcbfac741087747-200x200-1.jpg","attrs":{"Brand Name":"Sight","Model Number":"XD-A001","Minimum Order Quantity":"1","Panel Style":"Lcd","warranty":"1 year","whiteboard type":"Interactive whiteboard","Place of Origin":"Guangdong, China","Application":"Conference, Office, Education","aspect ratio":"16:9","color":"Black","Contrast Ratio":"1200:1","folded":"No","Frame Material":"Aluminum","Height":"100","Input Type":"Hd mi","Installation":"Wall mount","Maximum Resolution":"3840 X 2160","Orientation":"Horizontal","Overall depth":"10","package dimensions":"160x100x20cm","product dimension":"1488X897X88 mm","Recommended use":"Office","Screen Refresh Rate":"60hz","Target Audience":"Student","Weight":"68kg","Width":"150","Writing method":"Pen\/finger touch"}}

{"cid":"91220330","title":"4K 98 Inch Interactive Multi-Touch Screen WhiteBoard 16:9","imgUrl":"https:\/\/img.chinax.com\/nimg\/a0\/9f\/a55b25b2eb6ab241c0ad6b7526a4-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"MTHGH","Model Number":"XYC-98","Minimum Order Quantity":"1 Set","Delivery Time":"7-10 work days","Place of Origin":"China","Certification":"CE FCC ROHS ISO14001 ISO45001 ISO9001","Payment Terms":"L\/C, T\/T, Western Union","Supply Ability":"10000 Set","Packaging Details":"Standard carton package : carton+ plastic bag+ foam+ honeycomb paperboard+ pack thread.","Size":"98 inch,55\/65\/75\/86\/110 inch Optional","Aspect Ratio":"16:9","Brightness":"450cd\/m2","Touch Points":"20 Touch Customized Options","Response Time":"5ms","Product Name":"Meeting Room Interactive Board, Meeting Room Touch All-In-One Machine, Sliding Touch All-In-One Machine","Technology":"Infrared","Connectivity":"USB, HDMI, VGA, Wi-Fi","Interface Type":"USB , VGA,DP","Voltage":"AC 100-240V 50\/60Hz"}}