Sonoff Zigbee CC2531 USB dongle is a fully operational USB device that provides a PC interface to IEEE802.15.4 / ZigBee applications.
The USB dongle comes with CC2531ZNP-Prod firmware and can be plugged directly into your PC/Raspberry etc and used as a Zigbee packet sniffer.
*Note: Requires a wifi-to-zigbee hub to work * Please purchase the Sonoff Zigbee Bridge