64 Ports Modem Pool is a big bulk sms machine which consists of 64 of 4G modems. The modem pool provides an efficiency way for management of numbers of modems. After connecting the modem pool to the computer through USB cable, the computer shows 64 COM Ports. You can use 'AT Command' or some software to control each of the modems for sending SMS and changing imei. Technical Parameters: (1)Type: 64 Port 4G Modem Pool. (2)Module: SIMCOM SIM7600. (3)Working Frequency: *SIM7600E: LTE-FDD B1/B3/B5/B7/B8/B20 2100/1800/850/2600/900/800MHz, UMTS/HSPA+ B1/B5/B8 2100/850/900MHz, GSM/GPRS/EDGE B3/B8 1800/900MHz. *SIM7600A: LTE-FDD B2/B4/B12 1900/1700/700MHz, UMTS/HSPA+ B2/B5 1900/850MHz. *SIM7600SA: LTE-FDD B1/B2/B3/B4/B5/B7/B8/B28 2100/1900/1800/1700/850/2600/900/700MHz, UMTS/HSPA+ B1/B2/B5/B8 2100/1900/850/900MHz, GSM/GPRS/EDGE B5/B8/B9/B2 850/900/1800/1900MHz. (4)Interface: USB Port. (5)Power Source: 5-24V DC. (6)Support Bulk SMS/IMEI Change/AT Command/Send and receive SMS. (7)Control via AT Commands. (8)Packing List: One unit Modem,One Piece USB Cable ,One Piece Power Supply Adapter,One Piece Driver CD,64 Pieces Antennas.