Ubiquiti POE Injector, 24VDC, 12W, Features earth grounding/ESD protection and power LED.

Ubiquiti PoE Adapters provide a variety of features to help protect your PoE devices:

Features: – 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.