palm altitude area gps measuring tool

{"cid":"91221003","title":"Over Voltage Protected Wireless Signal Jammer AC 100V-250V 2G 3G 4G WiFi GPS Frequency Blocker","imgUrl":"https:\/\/img.ismap.com\/nimg\/3a\/c5\/da5a63dfa81c92778261ca213d2d-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"NUO AN YUE","Model Number":"DP-39","Minimum Order Quantity":"1","Delivery Time":"Within 3 work days","Place of Origin":"Shenzhen, China","Packaging Details":"Durable case or box","Payment Terms":"L\/C, D\/A, D\/P, T\/T,","Supply Ability":"100000\/month","Operation Temperature":"-20 ...+50 Centigrade Degree","Jamming Range":"\u22641 Kilometer","Input Voltage":"AC100V ~ 250V, 50Hz ~ 60Hz To DC 24V","System Protection":"VSWR, Over-voltage, Over-current","Output Power":"10-30W","Frequency Range":"2G\/3G\/4G\/WiFi\/GPS","Block Frequency":"FM 40-90MHz"}}