| Manufacturer | Sony |
|---|---|
| Digital Input/Output | 3.3 V or 5 V digital I/O |
| Audio Input/Output | 2 analog / 4 digital microphone inputs |
| External Memory Interface | micro SD card slot |
| Min. Operating Temperature [°C] | -10 |
| Max. Operating Temperature [°C] | 40 |
| Min. Storage Temperature [°C] | -20 |
| Max. Storage Temperature [°C] | 60 |
| Max. Operating Humidity [%] | 80 |
| Max. Storage Humidity [%] | 80 |
The Spresense LTE extension board adds LTE connectivity to the Spresense main board and carries an on-board antenna and a nanoSIM card holder. It also extends the interfaces of the Spresense main board with multiple mic inputs, headphone jack and microSD card slot. The Spresense main board and the Spresense LTE extension board are connected by a board-to-board connector.
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