250m distance audio guide system

{"cid":"91171271","title":"15dBm Transmitter Audio Guide System","imgUrl":"https:\/\/img.chinax.com\/nimg\/14\/5a\/7068917242d5aa82330331df848e-200x200-1.jpg","attrs":{"Brand Name":"YingMi","Model Number":"E8","Place of Origin":"China","Certification":"CE,RoHs","Feature":"Explain","Transmitter Power":"15dBm","Warranty":"1 Year","Modulation Mode":"GPSK","Receiving Sensitivity":"-110dBm","Working Distance":">=250m","Wireless Range":"200 Meters","Battery Capacity":"310mAh"}}

{"cid":"91199845","title":"4K 4096x2160p DVI Fiber Converter Single Mode 750m LC Connector DVI to Fiber Extender","imgUrl":"https:\/\/img.chinax.com\/nimg\/45\/02\/f5b1a1b6484272fe7701a52e1dc5-200x200-1.jpg","attrs":{"Brand Name":"NUFIBER","Model Number":"NF-101MB-T\/R","Minimum Order Quantity":"1pair","Delivery Time":"1~3working day after payment","Certification":"CE RoHS FCC","Place of Origin":"China(mainland)","Payment Terms":"T\/T, ","Supply Ability":"1000pair\/month","Packaging Details":"Packing Size\/per boxes:21mm*15.6mm*5.3mm 40 Boxes \/ carton or As Your Mind","Product Name":"DVI Optical Extender","DVI input\/Output":"1x DVI-D 18+1 Male connector","Color":"Black,Golden","Dimension":"39* 59* 15 mm","Fiber Type":"MM;1xLC Connector","Distance":"500meters","Support resolution":"1920x1200\/60Hz","Warranty":"1 Year","Power":"DC5V 1A","Working Temperature":"0\u2103~+50\u2103"}}

{"cid":"91200029","title":"250W High Power 4 Ports Poe Switch Fast Cooling Dante Poe Switch","imgUrl":"https:\/\/img.chinax.com\/nimg\/79\/f2\/589d48a0e88c9e399934428b90ef-200x200-1.jpg","attrs":{"Price":"USD8-USD18","Brand Name":"HK","Model Number":"HK-F1R5","Minimum Order Quantity":"100PCS","Delivery Time":"10-15WORKING DAYS","Certification":"FCC, ce, RoHS, CE FCC RoHS ISO9001:2015","Place of Origin":"SHENZHEN","Payment Terms":"L\/C, D\/A, D\/P, Western Union","Supply Ability":"5000000PCS\/YEAR","Packaging Details":"118*95*28mm","Communication Mode":"Full-Duplex & Half-Duplex","Transmission Rate":"10\/100Mbps","Ports":"4+1ports","Operating temperature:":"-20~+55\u00b0C","Total PWR \/ Input Voltage:":"65W (AC100-240V)","PoE Ports:":"Port 1- 4","Switch Capacity:":"1.6Gbps","Function:":"POE"}}