Two buttons and two LEDs for user interaction To run zigbee2mqtt for the control of Zigbee products like BASICZBR3, S31 Lite Zb in your home automation system, a CC2531 USB dongle integration is recommended. The CC2531 USB dongle is a fully operational USB device which provides a PC interface to IEEE802.15.4 / ZigBee applications. Comes with CC2531ZNP-Prod firmware, the dongle can be plugged directly into your PC, Raspberry Pi, or similar devices and used as a Zigbee packet sniffer. Yes, it is a ready-to-go CC2531 USB dongle for zigbee2mqtt application Flashed with CC2531ZNP-Prod firmware for zigbee2mqtt application Features 8 IO connectors Includes debug interface Size: 5.6 x 1.6 x 0.7 cm Assembly status: Ready-to-Go Compatibility: Widely compatible with Zigbee systems Model Number: Zigbee CC2531 USB Dongle Color: As shown in image Material: Polycarbonate and metal Package Contents: 1 x USB Dongle Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.