Specification: Origin: Mainland China Communication method: Zigbee Main functions: 1. First of all, a very important function is to use as a PacketSniffer, using cC2531 USB Dongle with ackn near er to grab wireless data packets, which is very helpful in the development of wireless protocols. For example, two CC2530S communicate with each other, but the receiving end always has no data. This requires the cC2531 USB Dongle to analyze whether the sender has not sent data or the data sent is incorrect.The factory default is this function. 2. Secondly, another important function is used to develop USB HID and cDc devices. cC2531 USB Dongle can be used as the receiving terminal to control the computer. 3. Used as a cc2531 development board. Features: 1. Flash CC2531ZNP-Prod firmware for zigbee2mqtt applications  2. Leads out 8 IO connectors  3. Debugging interface  4. Size: 57x17x7mm/2.24x0.67x0.28inch 5. Two buttons and two LEDs for user interaction Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x USB Dongle 1. Flash CC2531ZNP-Prod firmware for zigbee2mqtt applications 2. Leads out 8 IO connectors 3. Debugging interface 4. Size: 57x17x7mm/2.24x0.67x0.28inch 5. Two buttons and two LEDs for user interaction