821 mhz wireless tour guide system

{"cid":"91171271","title":"Tour Guide System 796.0 - 821.0mhz With Clear Sound Quality","imgUrl":"https:\/\/img.ismap.com\/nimg\/4d\/15\/d0d9ed062e3c2099d08c5c42c488-200x200-1.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","Frequency response":"20Hz-16KHz","Working frequency":"746-823MHz","Channel quantity":"23CH","Transmitter power":"15dBm","Dimensions":"86mm\u00d760mm\u00d719mm","Distortion factor":"<1%","Working distance":">=250m","Warranty":"2 years","Brand":"YingMi","Frequency offset":"<3k"}}