GA6-B is a 4-band GSM/GPRS module, the working frequency bands are: EGSM 900MHz, GSM850MHz and DCS 1800, PCS1900. GPRS coding format -1, -2, -3 and -4. GA6-B is embedded with TCP/IP protocol, and the extended TCP/IPAT makes it convenient for users to use TCP/IP protocol, which is very useful when users do data transmission applications. Wide-area coverage: GPRS has good coverage in 34 provinces across the country, and it is the 2G communication standard globally. Basically, you can surf the Internet via GPRS wirelessly where you can make a phone call; always online: as long as the GPRS application is activated, it will always remain online, similar to a wireless dedicated line network service. Billing by volume: Although the GPRS service remains online all the time, you don't have to worry about the cost; it is only billed when communication traffic is generated. High-speed transmission: At present, GPRS can support a transmission rate of 85.6Kbps, and the theoretical transmission rate can reach more than 100 Kbps. with its ultra-small size, ultra-low power consumption and wide operating temperature range, GA6 is an perfect solution for M2M applications, suitable for automotive, industrial and PDA, personal tracking, power environment testing, Wireless POS, smart metering and other M2M applications provide complete GSM/GPRS SMS, data transmission and voice . Working voltage 3.5V-4.2V;current consumption in SLEEP mode is 0.9mA; four-band: GSM850, EGSM900 and DCS1800, PCS1900 can automatically search for four frequency bands. Comply with GSM Phase2/2+I GPRS ; sensitivity Less than -107; support voice calls; support SMS text messages; support China Mobile and 2G, as well as global GSM networks GPRS data characteristics, maximum data rate, download 85.6Kbps, upload 42.8Kbps; support serial port multiplexing function in line with GSM07.10 protocol Support 2 serial ports, one download serial port, one AT port; AT commands support standard AT and TCP/IP interfaces; support digital audio and analog audio, support , FR, EFR, voice encoding; Colour:blue Material: PCB Size: 22.8mm x 16.8mm x 2.2mm Package Contents: 1 set of development board Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.