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SIM 900A Module Developemnt Board Card Static Electricity Protects Good Signal Standard Antenna SMSGSMGPRSSTM32A6 Transmission Electronic Component

【STANDARD ANTENNA】 SIM 900A module is equipped with standard antenna, the signal is very good, comparable to non-low cost spring antenna. 【AUDIO INTERFACE】 The audio interface of the wireless expansion module includes earphone and microphone interfaces, and 2.54mm pitch pin leads to facilitate external connections. 【VOLTAGE】 The onboard high‑efficiency DCDC buck circuit can stabilize the 5‑18V power supply at about 3.8V. Onboard TTL level serial port, the serial port level is matched, and it can be directly connected with 5V or 3.3V system without conversion. 【MOBILE PHONE CARDS】 The wireless expansion module 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. 【PROTECT】 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.