Seeed XIAO BLE - nRF52840 is a low-power, ultra-small, super cost-effective Bluetooth dev board based on powerful Bluetooth 5.0 MCU -- Nordic nRF52840 and is designed for wearable devices and IoT projects.

Meanwhile, Seeed Studio also offers an advanced version: Seeed XIAO BLE Sense - nRF52840. It is with onboard 6-axis IMU and digital microphone and thus is an ideal dev board for TinyML(Tiny machine learning) AI projects.

Seeed Studio 102010448XIAO BLE nRF52840 - Supports Arduino / MicroPython - Bluetooth5.0 with Onboard AntennaSeeed XIAO BLE is an ultra-small size, ultra-low power Bluetooth development board based on the Nordic nRF52840. It features an onboard Bluetooth antenna, onboard battery charging chip, and 21*17.5mm thumb size, which makes it ideal for IoT projects.
Seeed Studio 102010469Seeed XIAO BLE nRF52840 Sense - TinyML/TensorFlow Lite- IMU / Microphone - Bluetooth 5.0Seeed XIAO BLE nRF52840 Sense is a tiny Bluetooth LE development board designed for IoT and AI applications. It features an onboard antenna, 6 Dof IMU, microphone, all of which make it an ideal board to run AI using TinyML and TensorFlow Lite.

Check out Partco's full range of XIAO development cards here