Ubiquiti PBE-M2-400 PowerBeam M2 18dBi 2.4GHz airMAX 400mm 20km+ PoE Ubiquiti Networks PBE-M2-400 PowerBeam M2 has a tight beamwidth, improving noise immunity, ideal for crowded areas. Operates on 2.4GHz frequency, with 18dBi. The new PowerBeam M has a compact, all-in-one design with uniform beam width, efficient footprint and a faster processor. The PowerBeam can be easily mounted in a variety of ways thanks to the innovative mechanical design.