Ubiquiti PoE Adapters provide a variety of features to help protect your PoE devices: - Surge protection - Clamping protection - Maximum surge discharge - Peak pulse current - AC cable with earth ground Electrostatic discharge (ESD) is the leading cause for outdoor device failures. You can effectively protect against ESD damage using a grounded Ubiquiti PoE Adapter, TOUGHCableTM,... and TOUGHCable Connectors.