What is the difference between this unit and the eth-sp?

The eth-sp2 is an improved version of the original eth-sp.

Will this protect outdoor CAT5e cable from lightning?

Properly installed these should reduce and in some cases eliminate equipment damage from various high-voltage atmospheric situations including lightning. But lightning and wiring and lightning rods and other protection equipment is complicated and should be properly designed and installed to protect critical systems, and these gas-discharge-based units are one good component in a design. Ubiquiti probably has good design materials. These units are an inexpensive way to improve protection, but don't be fooled... Nothing will save typical outdoor WiFi gear from a direct strike, but these can help keep the damage from going further than that. Be sure to use shielded network cable with shielded connectors and ensure the connectors and cable shield are robustly connected -- sometimes the little ground wires break off.

How do you know when the surge is no longer working?

When it won't pass an Ethernet signal. The ESP circuit sacrifices it self when it suppresses the surge.

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Description

⚡ Protect your network, power your productivity.

ROBUST SURGE DEFENSE - Shield your outdoor PoE devices from damaging electrical surges with 6.1 watts of power absorption.
COMPACT LIGHTWEIGHT - Sleek white design at just 80 grams fits discreetly into any network setup.
SEAMLESS GIGABIT SPEED - Maintain lightning-fast 1 Gbps data transfer without compromising network performance.
EFFORTLESS INSTALLATION - Plug-and-play design with standard RJ45 connectors—get protected in seconds, no tech hassle.
WEATHER READY DURABILITY - Engineered for outdoor use, ensuring reliable protection rain or shine.

The Ubiquiti Networks Ethernet Surge Protector Gen 2 is a compact, outdoor-ready device designed to safeguard your PoE-enabled Ethernet equipment from electrical surges. Supporting Cat 6 cables and 1 Gbps data transfer, it offers plug-and-play RJ45 connectivity with 6.1 watts of surge absorption, ensuring uninterrupted, high-speed network performance in any environment.

Specifications

Brand	Ubiquiti Networks
Connector Type	RJ45
Cable Type	Ethernet
Compatible Devices	GbE networks
Special Feature	Data Transfer
Compatible Phone Models	GbE networks
Recommended Uses For Product	Protect outdoor PoE devices from electrical surges
Ethernet cable category	Cat 6
Colour	White
Connector Gender	Male-to-Male
Data Transfer Rate	1 Gigabits Per Second
Shape	Round
Item Weight	80 Grams
Indoor/Outdoor Usage	Outdoor
Number of Items	1
Wattage	6.1 Watts
Outer Material	Other
Manufacturer	Ubiquiti (Taiwan) Sales Limited, 37F., No. 7, Sec. 5, Xinyi Rd, 11049 Xinyi Dist, Taipei City, Taiwan, Ubiquiti Networks
UPC	810354021633 817882023900 701017581635
Global Trade Identification Number	00701017581635, 00810354021633, 00817882023900, 04056572757138
Item Height	32.5 Millimeters
Item Width	6.1 Centimeters
Product Dimensions	9.1 x 6.1 x 3.25 cm; 80 g
Batteries	1 Lithium Ion batteries required.
Item model number	ETH-SP-G2
Computer Memory Type	DIMM
Wireless Type	802.11n
Voltage	240 Volts
Are Batteries Included	No
Lithium Battery Energy Content	2 Kilowatt Hours
Lithium Battery Weight	2 Grams
Number of Lithium Ion Cells	5
Number of Lithium Metal Cells	5
Included Components	Eth SP, M5 Self Tapping Screw, M5 Serrated Washer
Manufacturer	Ubiquiti Networks
Country of Origin	China
Item Weight	80 g

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