The Spresense LTE Extension Board enhances functionality with robust LTE connectivity for the Spresense main board, featuring an onboard antenna and a nanoSIM cardholder.Expanding the main board's interfaces, it offers multiple microphone inputs, a headphone jack, and a microSD card slot. Link them effortlessly via a board-to-board connector to unlock new potential.Engineered for technological sophistication, it supports LTE-M and NB-IoT standards through the Sony ALT1250 chipset, providing low-cost, low-power, and extensive coverage solutions. 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