The REL52867 is a ZigBee USB dongle accessory kit from Schneider Electric, designed to bridge wireless sensor networks to a switchboard host. It communicates at 12 Mbit/s over the Zigbee protocol, and the kit includes cords for up to 20 sensors — so you can pull temperature, humidity, or contact data from a distributed sensor field into a single USB port on a panel PC or gateway.
Mechanically it's a compact dongle: 9 mm deep, 38 mm wide, 19 mm tall. That 9 mm depth means it won't overhang a standard USB port on a DIN-rail gateway or industrial panel PC — it stays flush enough to keep the gland plate clear. The operating range is -25 to 85 °C, so it lives in the same enclosure as the switchgear without needing a cooled compartment.