serial to 2g iot cellular modem

{"cid":"91199119","title":"Serial To 2G IOT Cellular Modem","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/e4\/80\/524abe99e38087d084b9489ea571-200x200-1.jpg","attrs":{"Price":"USD49-55\/PCS","Brand Name":"IOTROUTER","Model Number":"ZHC2921","Minimum Order Quantity":"1PCS","Delivery Time":"1 WEEK","Certification":"CE FCC RoHs","Place of Origin":"Sichuan, CHINA","Payment Terms":"L\/C, T\/T, Western Union","Supply Ability":"50000PCS\/MONTH","Packaging Details":"270*180*55mm CARTON PACKAGE","Material":"Galvanized Steel Sheet","Product Name":"Serial To 2G IOT Cellular Modem","Interface":"RS485\/4DI\/4DO\/4AI","Protocol":"MODBUS TCP\/RTU","Function":"Remotr Control","Application":"Iot Automation","Working Voltage":"12V","Module Type":"GPRS","Customized":"Support","Size":"159*95.9*27.5mm","Color":"Black"}}

{"cid":"91220825","title":"Highly Sensitive IOT Industrial GSM GPRS IP 4G SMS Modem with RS232 RS485 Serial Ports","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/7f\/d7\/1e79ce0f6ddc0564c113a4dbe7f8-200x200-1.jpg","attrs":{"Price":"$299.00\/pieces","Brand Name":"BGT","Model Number":"BGT-2816","Minimum Order Quantity":"1 piece","Place of Origin":"Beijing, China","Product name":"IOT industrial gsm gprs 4g DTU \/ sms LTE IP modem with rs485\/RS232","Cellular Module":"Industrial cellular module","Standard and Band":"Support:TDD-LTE,FDD-LTE,EVDO,WCDMA,TD-SCDMA,CDMA1X,GPRS\/EDGE","TX power":"<23dBm","RX sensitivity":"<-93.3dBm","CPU":"Industrial 32 bits CPU","FLASH":"512KB(extend to 8MB)","SRAM":"256KB","Indicator":"\"Power\",\"ACT\",\"Online\"","Antenna":"Standard SMA female interface,50 ohm","Packaging Details":"Box"}}