Does this come with an AC adapter? If not, can you link us to it?

https://www.amazon.com/Geekworm-Adapter-Raspberry-Expansion-Management/dp/B07413Q5Y4/ref=sr_1_4?keywords=Geekworm&qid=1575656465&s=electronics&sr=1-4

What is the specification for the 4 pin header. I want to use an external switch to control power, so I will need a 4 pin pigtail and need the size?

This link has all the information that you should need. http://www.raspberrypiwiki.com/index.php/X735

Can this hat detect a power outage and safely shutdown the ras pi before a ups runs out of power?

Actually it cannot "detect" a power outage. You would have to employ some sort of signaling from your UPS to the Pi. Then the UPS monitoring service would need to start an orderly shutdown. If you've installed the required scripts, the Pi will be shut down gracefully and other devices shut down properly... e.g. SSD or HDD.

can this be used with X728?

Hi friend, If you have X728, then you do not need the X735, for cooling, you can consider to use X728-A1 or P165-A embedded aluminum alloy heatsink. X735 does not support to use with X728. best regards, Geekworm Team

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Geekworm

Product ID: 261581566

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Details

Brand
Geekworm
Model name
X735 V3.0
CPU model
80486
Connectivity technology
USB
Included components
1 x Screws 1 1

⚡6V-30V wide voltage input

🌀PWM temperature-controlled cooling fan

🔌Safe shutdown via software control

Description

⚡ Power up smart, cool down faster, and shut down safe — the ultimate Pi upgrade!

BROAD COMPATIBILITY - Works flawlessly with Raspberry Pi 5, 4B, 3B+, and 3B, plus multiple Geekworm expansion boards.
SMART PWM COOLING FAN - Automatically adjusts fan speed based on temperature to keep your Pi cool under pressure.
SEAMLESS SAFE SHUTDOWN - Ensures your Raspberry Pi powers off safely, protecting your data and hardware.
STACKABLE 40 PIN HEADER - Reserve expansion options without sacrificing power management capabilities.
UNIVERSAL WIDE VOLTAGE INPUT - Supports DC 6V-30V for versatile power sources, perfect for any setup.

The Geekworm Raspberry Pi X735 V3.0 is a multifunctional expansion board designed for Raspberry Pi models 5, 4B, 3B+, and 3B. It features a wide DC voltage input range (6V-30V), intelligent power management with safe shutdown capabilities, and a PWM-controlled cooling fan that automatically adjusts to temperature changes. Its stackable 40-pin header ensures compatibility with various add-on boards, making it an essential upgrade for professionals seeking reliable, efficient, and safe Raspberry Pi operation in demanding environments.

Specifications

Processor	80486
Hard Drive	1
Wireless Type	802.11b
Brand	Geekworm
Series	X735 V3.0
Item model number	TB-2019-06
Operating System	DietPi, Raspbian Stretch/ RetroPie/Twister OS v2.0.2, Ubuntu, Volumio 3, myNode OS/ Umbrel
Item Weight	1.76 ounces
Product Dimensions	2.56 x 2.28 x 0.98 inches
Item Dimensions LxWxH	2.56 x 2.28 x 0.98 inches
Color	Black
Processor Brand	1
Number of Processors	1
Computer Memory Type	Unknown
Hard Drive Interface	Unknown
Hard Drive Rotational Speed	1
Manufacturer	Geekworm
ASIN	B07R45W1LN
Is Discontinued By Manufacturer	No
Date First Available	April 21, 2019

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