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 to support OTA-DFU air upgrade: Yes USB burning program: Can burn the program repeatedly (button reset) Support system: forMAC/Linux/ Application scenario: Internet of Things/Building Receiver/Wearable Medical LED: Yes Wireless transmission power: -20dBm~+8dBm Wireless receiving baud 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.