E104-BT5040U features the nRF52840 chip and comes with factory firmware supporting connection and plug-and-play functionality. It offers a range of peripheral interfaces including UART, I2C, SPI, and A , facilitating secondary development. Equipped with a 32MHz and 32.768kHz industrial-grade crystal oscillator, it supports Bluetooth 4.2 and Bluetooth 5.0. The module's functions and pinout are compatible with the Nordic official nRF52840 USB Dongle, and it is compatible with all programs designed for the nRF52840-Dongle. Product model: E104-BT5040U Operating voltage: 4.3–5.5V Frequency band: 2360–2500MHz Chipset: nRF52840 Transmit current: 17.05mA Receive current: 8.27mA Transmit power: 7.5–8.5dBm Reference range: 250m Supported protocols: BLE 4.2, BLE 5.0 Interface type: USB, 1.27mm header Antenna: PCB onboard antenna Color: Blue Material: Plastic Package includes: 1 x E104-BT5040U Bluetooth Module Please note: The package includes only the items listed above. Other accessories are not included. Due to lighting effects and monitor settings, the color of the item in the photo may slightly differ from the actual product. Measurement error allowed is +/- 1–3cm.