Specification: Item Type: SIM 900A Module Product Details: 1. Power Supply Requirements: 5V-18V power supply, current needs to provide 1A or above; 2. TTL level serial port is compatible with 3.3V and 5V microcontrollers. 3. It can truly communicate directly with 51/STM32/MP430 and other single-chip computers; 4. When debugging with a computer in the initial stage, it is recommended to use the CP2102 USB-TTL module to power the module and communicate 5. When using the single-chip microcomputer control module, you can also monitor the return data of the instruction through the USB-232 monitoring module, which greatly facilitates finding the problem, especially suitable for small partners who use 51 single-chip microcomputers. 6. The standby is about 30MA, and the sleep state can be set to about 10MA for low power consumption. 7. Support SMS, GPRS data transmission, MMS, DTMF, HT?P, FTP, PPP dialing and other functions. 8. At the same time, the hardware contains a reset pin. When a problem occurs in the module, this pin can be used to reset it. 9. The development board supports 2G/3G/4G mobile phone cards. Package List: 1 x 900A Module 1 x Antenna 1 x Accessories

Supplement :The SIM card static electricity protects the IC and prevents the SIM card from being damaged by static electricity. Even so, it is necessary to develop the habit of plugging in the card or patch cord when the device is powered off. Wide Applicability: This SIM 900A module device supports various types of mobile phone cards and supports 2G network, as long as it is an ordinary mobile phone card, whether it is a 4G or 2G card. The audio interface includes earphone and microphone interface, and the 2.54mm pitch pin leads out for easy external connection. Convient :The device supports multiple models of mobile phone cards, and supports 2G networks, as long as the card is an ordinary mobile phone card, whether it is a 4G or 2G card. Standard antenna SIM 900A module is equipped with standard antenna, the is very good, comparable to non low cost spring antenna.