This is the pre-soldered version of the XIAO nRF54L15 Sense, a powerful and compact development board built around the Nordic nRF54L15 SoC, featuring a 128 MHz Arm Cortex-M33 core with 1.5 MB NVM. Measuring just thumb-sized, this board is designed for IoT applications with comprehensive wireless connectivity. It supports multiple wireless protocols including BLE 6.0, Matter, Thread, and Zigbee (IEEE 802.15.4-2020), and includes a new 4 Mbps mode for proprietary 2.4 GHz protocols. With ultra-low power consumption, it is well-suited for battery-powered IoT devices. The board provides 14 GPIOs, a USB Type-C interface, and onboard battery charging capabilities. This version includes an integrated digital microphone and a 6-axis IMU for sound and motion sensing. Enhanced security features help protect IoT deployments. Developers can use the Nordic Connect SDK and PlatformIO with RTOS support for efficient development workflows. It is compatible with ecosystems such as Sidewalk, Find My, and Find My Device through the Connect SDK. Security features include secure boot, secure firmware updates, secure storage, TrustZone-enabled trusted execution environment, cryptographic acceleration with side-channel protection, and tamper detection. Full support for Nordic Connect SDK and PlatformIO enables streamlined embedded development. (Note: IDE support is not currently available.) Color: Black Material: PCB Package Contents: 1 x XIAO nRF54L15 Sense development board Only the items listed above are included; other products are not included. Note: Lighting and display differences may cause slight variations between the product color in images and the actual color. Measurement tolerance is +/- 1-3 cm.