Welcome to the store! Technical Parameters: Bluetooth version: 5.3 Main chip: Nordic nRF52840 Supporting APP: PC side Connect Power supply voltage (mode): USB power supply (5V) Button: Yes Wireless transmission distance: 0~60m Working temperature: -20~ 60°C Whether OTA-DFU air upgrade is supported: Yes USB burning program: Can burn the program repeatedly (button reset) Supported system: for MAC/Linux/ Application scenario: Internet of Things/Building Receiver/Wearable Medical Equipment LED: Yes Wireless transmission power: -20dBm~+8dBm Wireless receiving rate: 9600/115200 Storage: 1MB Flash, 256kb RAM Transmission rate (maximum): 2Mpbs Can firmware be burned: Yes Communication protocol: Bluetooth /Thread; Matter /Zigbee; Bluetooth Mesh/ANT Color: Black Material: ABS Package Contents: 1 x Bluetooth Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real one. The allowed measurement error is +/- 1-3cm. Your satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!