Anti-noise shield PBE-400 is designed to seamlessly integrate with Ubiquiti PowerBeam M5-400 25dBi & M2-400 18dBi 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)