Where to begin? The LinkIt One is packed with features: GSM, GPRS, Wi-Fi, Bluetooth BR/EDR/BLE, GPS, Audio codec, SD card reader, and a rich pinout for sensors, peripherals, and Arduino shields. At 3.3″×2.1″, it’s larger than most boards marketed for wearables or IoT devices, but if the size doesn’t make you balk, then it will be more than enough for most projects you can dream up.