Anti-noise shield PBE-300 is designed to seamlessly integrate with Ubiquiti PowerBeam M5-300 22dBi antenna. Substantially reduces interference from nearby networks and network devices. Shield reduces noise level, helping to improve signal strength of wireless set. CNC technology used in manufacturing process, shield is made with needed precision from grey coated aluminium. https://www.ubnt.com/airmax/powerbeam/ airMAX (Fixed Outdoor Wireless)