GPRS Board GSM Module Kit SIM Card TTL Serial Port (without )

The serial port is a TTL serial port, which can be directly linked with the controller. No need of 232 Onboard signal lights all the way. It flashes slowly when there is a signal, it flashes quickly when there is no signal Module power-on automatically starts, automatically finds the Features: The serial port is a TTL serial port, which can be directly linked with the controller. No need of 232. Onboard signal lights all the way. It flashes slowly when there is a signal, it flashes quickly when there is no signal. Module power-on automatically starts, automatically finds the . Small size, no other GSM module is smaller than this module. Full machine chip processing, reflow soldering and stable performance. The power supply can be powered directly from a lithium battery or from a 5V supply. By default, the pin header is not welded, and leaving more space for customers to expand. Specification: Material: Plastic Module Size: Approx. 2.5*2.3 cm Celsius 1*0.9 in Module Model: latest module, performance exceeds M590 Working Voltage: 3.7.4.2V (current 1A, please handle it) Support : Support for China MobileCelsiusChina UnicomCelsiusGlobal Guad-band Package list: 1 * GPRS Board GSM Module SIM Card TTL Serial Port 1 * Spring-shaped 2 * Pin Header