E104BT54S is a wireless systemonchip (SoC) module designed around the BLUENRG355MC chip solution. It supports multiple transmission methods in the 2.4 GHz band, TTL level output, and 3.3 V IO port voltage. The BLUENRG355MC chip is built on a performance ARM CortexM0 32bit core with a working frequency range of 1 MHz to 64 MHz. It includes speed memory up to 64 kB SRAM and a wide range of enhanced I/Os and peripherals. For full specifications, please refer to the official documentation. This module is a pure hardware SoC module with no program preinstalled at the factory. Bluetooth based functions such as broadcasting, scanning, connection, and transparent transmission are available after user development on the module. Supports BLE 5.1. A Bluetooth module developed based on BLUENRG355MC. Benefits and how it helps Flexible wireless BLE performance in the 2.4 GHz band with TTL serial style interfacing and 3.3 V IO compatibility, enabling easy integration with common microcontrollers. performance yet compact MCU core and memory enable robust Bluetooth services and data handling in embedded systems. Pure hardware module provides a clean slate for Bluetooth software development and integration, allowing Bluetooth broadcasting, scanning, connections, and transparent data transmission after development. Use scenarios Custom BLE peripheral development: integrate with a host microcontroller via TTL interface to add BLE control and data exchange for devices such as sensors, actuators, or wearables. BLE broadcasting and scanning: implement asset tracking, indoor positioning, or proximity services by leveraging advertising, scanning, and connection capabilities. Transparent data bridging: create a direct data path between a host controller and BLE devices to offload Bluetooth radio tasks while maintaining full control over communication. Compatibility and interoperability Based on BLUENRG355MC with BLE 5.1 support, enabling modern BLE features in applications requiring reliable wireless connectivity and interoperability with BLEenabled devices.