GPRS MODEM RS485 SIM900A Based on Simcom module SIM900A With TCP/IP stack 900/1800MHZ STK,internet, data, sms, GPRS MODEM RS485 SIM900AProduct descriptionGeneral Features Industrial designAluminum ... to +95 degreesSize 85*54*25mmWeight 110gAccessories: AC/DC adaptor, RS232 cable, antenna, 2 mounting plates, CD Specification for DataGPRS Class ...