The Spresense LTE Extension Board adds LTE connectivity to the Spresense main board and carries an onboard antenna and a nanoSIM cardholder. It also extends the interfaces of the Spresense main board with multiple mic inputs, a headphone jack, and a microSD card slot. The Spresense main board and the Spresense LTE extension board are connected by a board-to-board connector.

Compliant with LTE-M (LTE Cat-M1) and NB-IoT communication standards. Employs the Sony ALT1250 chipset, ensuring compliance with LTE-M (LTE Cat-M1) and NB-IoT communication standards. This enables developers to create systems and applications with low cost, low power consumption and wide-area coverage. (Compatible with US bands 2, 4, 12, 13; and EU bands 3 and 20)

Comes with a Truphone SIM so you can get started immediately.

Note: This is just the extension board. You'll need the main board as well.