WWZMDiB Mini SIM800L GPRS GSM Breakout Module, SIM Card Slot Onboard with Antenna ?Mini SIM800L GPRS GSM Breakout Module?: Supports quad-band GSM/GPRS network, available for GPRS and SMS message data remote transmission. Working Voltage?:3.7~4.2V ?Description of the blinking indicator?:Blinks every 1 second The module is running, but no connection to the cellular network has been established. Blinks once every 2 seconds, the GPRS data connection you requested is active. Blinks once every 3 seconds, the module has established a connection to the cellular network and is ready to send/receive voice and SMS messages. Description: Mini GSM / GPRS breakout board is based on SIM800L module, supports quad-band GSM/GPRS network, available for GPRS and SMS message data remote transmission. The board features compact size and low current consumption. With power saving technique, the current consumption is as low as 1mA in sleep mode. It communicates with microcontroller via UART port, supports command including 3GPP TS 27.007, 27.005 and SIMCOM enhanced AT Commands. Working Voltage: 3.5~4.2V Quad-band 850/900/1800/1900MHz Connect onto any global GSM network with any 2G SIM Make and receive voice calls using a headset or an external 8 speaker and electret microphone. Send and receive SMS messages. Send and receive GPRS data (TCP/IP, HTTP, etc.) . Scan and receive FM radio broadcasts. Lead out buzzer and vibrational motor control port. AT command interface with "auto baud" detection.

Blinks once every 3 seconds, the module has established a connection to the cellular network and is ready to send/receive voice and SMS messages. Blinks once every 2 seconds, the GPRS data connection you requested is active. ?Description of the blinking indicator?:Blinks every 1 second The module is running, but no connection to the cellular network has been established. Working Voltage?:3.7~4.2V. ?Mini SIM800L GPRS GSM Breakout Module?: Supports quad-band GSM/GPRS network, available for GPRS and SMS message data remote transmission.