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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Description

⚡ Keep your Pi powered, cool, and safe — the ultimate expansion board for pros!

BROAD COMPATIBILITY - Works flawlessly with Raspberry Pi 5, 4B, 3B+, 3B and multiple Geekworm expansion boards
SEAMLESS SAFE SHUTDOWN - Software-controlled power off prevents data loss and hardware damage
SMART THERMAL MANAGEMENT - PWM fan automatically adjusts to temperature, keeping your Pi cool under pressure
STACKABLE EXPANSION READY - Reserved 40-pin header lets you add more modules without losing functionality
UNIVERSAL POWER FLEXIBILITY - Supports Type-C, Micro-USB (5V ±5%, ≥3A) or DC 6-30V input for versatile setups

The Geekworm X735 V3.0 is a compact, multifunctional power management expansion board designed for Raspberry Pi models 5, 4B, 3B+, and 3B. It features wide voltage input (6V-30V), a PWM-controlled automatic cooling fan, and software-enabled safe shutdown to protect your device and data. Fully compatible with multiple Geekworm add-ons, it supports stackable headers for modular expansion, making it ideal for professional-grade Raspberry Pi projects requiring reliable power and thermal management.

Specifications

Brand	Geekworm
Manufacturer	Geekworm
Model	TB-2019-06
Model Name	X735 V3.0
Model Year	2022
Product Dimensions	6.5 x 5.8 x 2.5 cm; 50 g
Item model number	TB-2019-06
RAM memory maximum size	1 GB
Ram Memory Technology	LPDDR4
Computer Memory Type	Unknown
Hard Drive Interface	USB
Hard Disk Description	1
Operating System	Raspberry Pi OS
Processor Brand	VIA
Processor Type	80486
Processor Count	1
Processor Socket	1
Hardware Interface	USB
Compatible Devices	Raspberry Pi 5, 4B, 3B+, 3B, 2B, 3A+
Special Features	Lightweight
Mounting Hardware	1 x Screws pack with 1 jumper cap, 1 x X735 V3.0 Board
Number of items	1
Batteries Included	No
Batteries Required	No
Wireless Type	802.11b
Total USB ports	2
Connector Type	USB
Device interface - primary	Buttons
Manufacturer	Geekworm
Item Weight	50 g

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