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SIM900A V4.0 Kit Wireless Extension Module GSM GPRS Board with Antenna - the perfect solution for seamless wireless communication. Built around the advanced SIM900A chip, this module offers exceptional performance and versatility. With its dual power supply interfaces, VCC5 (5V power supply) and VCC4 (3.5–4.5V power supply), you have flexible options to meet your specific needs.Featuring optional power on self-starting (default) and control start, this module is designed for convenience and ease of use. It comes equipped with an onboard SMA (default) and IPX mini antenna interface, along with a reserved reset interface for SIM900A.With the ability to provide a robust power supply through the USB module, this module can handle large amounts of data effortlessly. We recommend a current of over 1A for optimal performance under high data load conditions. Additionally, it offers a low power standby mode, allowing you to set the data dormancy to as low as 10mA, conserving energy efficiently.Our SIM900A V4.0 Kit supports 2G and mobile phone 3G/4G cards, making it compatible with a wide range of devices. The serial port circuit is designed to support 3.3V single-chip microcomputers, while the TTL serial port supports both 3.3V and 5V single-chip microcomputers, ensuring seamless integration into your existing setup.To enhance the reliability of the SIM card circuit, we have incorporated the SMF05C ESD chip. Furthermore, the antenna circuit is thoughtfully designed to guarantee a short and straight path, ensuring optimum signal strength for uninterrupted communication.Upgrade your wireless communication experience with the SIM900A V4.0 Kit Wireless Extension Module GSM GPRS Board with Antenna. Shop now and enjoy seamless connectivity and outstanding performance.