Wireless communication frequency: 2.4GHz-2.48GHZ Supported protocols: Thread, Zigbee 3.0, Bluetooth 5.2 low energy consumption Electrostatic discharge protection: Yes Communication distance: 400M (unobstructed) Signal strength (dbm): 18.6 (inst ent test value) Antenna gain (dbi): 0 Maximum number of supported devices: 128 Applicable systems: for Home Assistant-ZHA, Home Assistant-zigbee2MOTT, OpenHAB Color: Black Material: Plastic+electronic component Package Contents: 1 x Gateway 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.