823mhz two way tour guide system

{"cid":"91171271","title":"008B Two Way Audio Guide Can Be Ask And Answer 250KHz","imgUrl":"https:\/\/img.ismap.com\/nimg\/ef\/14\/dda33fdd02a1e1c212eeb9af1d3c-200x200-1.jpg","attrs":{"Price":"negotiation","Brand Name":"YingMi","Model Number":"008B","Minimum Order Quantity":"1pcs","Delivery Time":"3-7 days","Certification":"CE,RoHs","Place of Origin":"China","Payment Terms":"L\/C, T\/T, Western Union, MoneyGram","Supply Ability":"10000pcs for one month","Packaging Details":"packed in carton box","Brand":"YingMi","Working frequency":"746-823MHz","Transmitter power":"15dBm","Channel spacing":"250KHz","Dimensions":"86\u00d760\u00d719mm","Power":"Lithium Battery","Working distance":">=250m","Warranty":"2 years","Working current":"\u226480mA","Distortion factor":"<1%"}}