u-blox : SARA-R4 ultra‑compact LTE Cat M1 / NB1 modules with global coverage
前言：
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At 16 x 26 mm, the SARA-R4 series are among the world’s smallest LTE Cat M1 / NB1 multi-mode modules offered in a single hardware design. They have software-based global band configuration, and come in an LGA package for easy manufacturing. The SARA R4 supports quad-band 2G (EGPRS) fallback, ultra low power consumption and cost optimized solutions making it ideal for the development of LPWA IoT applications.
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