rtk base and rover cheap mini gps tracker

{"cid":"91193213","title":"Kolida K6 1598 Channels Rover and Base Cheap Price with High Efficiency Land Surveying Instrument Rtk","imgUrl":"https:\/\/img.chinax.com\/nimg\/5d\/72\/02ef8af16af7d85432f429cd7bab-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"Kolida","Model Number":"K6","Minimum Order Quantity":"1 pc","Delivery Time":"1-3 working days","Certification":"CE","Place of Origin":"China","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union, MoneyGram","Supply Ability":"1000 pcs per month","Packaging Details":"Carton","product name":"DGPS","Operation System":"Linux","Transport Package":"Carton","Production Capacity":"1000set\/Month","Model NO":"K6"}}

{"cid":"91222653","title":"Low Power Mini Gnss Receiver Module Rtk Gnss Module For Cars","imgUrl":"https:\/\/img.chinax.com\/nimg\/63\/cd\/7db85138c0dd46c5e0d99d2fe182-200x200-1.jpg","attrs":{"Price":"CN\u00a557.93\/units 1-99 units","Brand Name":"Youwei","Model Number":"YW-25254G3","Minimum Order Quantity":"200","Place of Origin":"China","Certification":"CE\uff0cRohs","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union, MoneyGram Paypal","Supply Ability":"200000 PCS MONTH","Packaging Details":"PE Bag Cartons","Type":"GNSS Module","Country of Origin":"China","Brand":"Youwei","Chipset":"YW-25254G3","Application":"Car","Product name":"YW-25254G3 GPS module","Chip":"GK9501","Payment":"Paypal\\TT\\Western Union\\Trade Assurance","Feature":"Band","D\/C":"Newest","Battery":"Internal back-up battery","Operating temperature range":"-40 to 85\u2103C","description":"GNSS module","Cetificate":"ISO9001"}}