automatic tour guide system 2 4g frequency

{"cid":"91171271","title":"RFID Automatic Tour Guide System 2.4G Frequency Band","imgUrl":"https:\/\/img.ismap.com\/nimg\/5f\/da\/c2fd2e9958ac042647b30060778f-200x200-1.jpg","attrs":{"Price":"negotiation","Brand Name":"YingMi","Model Number":"M7C","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":"1000 pieces per week","Packaging Details":"packed in carton box","Brand":"YingMi","Technology":"RFID","Memory capacity":"2G or 4G-32G","Power supply":"Lithium battery","Weight":"50g","Coverage area":"0.5-30m adjustable","Emission frequency":"2.4GHz","Language":"8 language for optional","Frequency response":"20Hz-20KHz","Storage mode":"Adaptive Flash"}}