Will it work for a dc 10a 40v power source?

No, I believe is is restricted to 12VDC to power the board, the relay will switch isolated higher voltage

In the instructions, what does "for 8 times" mean in regards to pressing the learning button. Does it mean for 8 seconds or press it 8 times?

Press the receiver button 8 times continuously to reset the receiver's remote control data.

Inside the fob: physical switch or capacitive membrane? I need solder wires to the TX to connect to a different physical switch.

It has the feel of a tactical switch. Not at all like a common TV remote switch. However, both operate in a similar fashion. You'll likely have to scrape away some of the solder resist to make a good connection. The back of the fob has three screws... so you won't have to break it open. :)

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QIACHIP 433Mhz Universal Wireless Remote Control Switch DC 12V 1CH Relay Receiver Module RF Transmitter (2 Transmitters 2 Button+ 1 Receiver 1CH)

Product ID: 466307803

Details

Brand
QIACHIP
Color
DC 12V/1 + 2
Compatible Devices
Garage Door
Max Number of Supported Devices
20
Special Feature
Easy to

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Description

433 Mhz Universal Wireless Remote: Input Voltage 12 V, Working Mode of Wireless 433mhz rf module receiver and transmitter RF are Superheterodyne .
RF Switch DC: Transmitting distance: > 100 m ( open space), Only Support remote type: EV1527 learning code.
Wireless Relay 12v :Dimension of PCB:35 x 30 x 18 mm (L,W,H) ,Output terminal: NO , NC , COM.
It supports remotely and wirelessly control your Garage Door, Electronic Gates, Electrical Appliances and other telecommand equipments ,Electrical Appliances, Motorcycle Alarm, Car Sunroofs, Heating Systems, etc. Bringing you brand new experience of remote control, Please don't miss it.
Support Remote Control up to 20 Pieces： any one with the same frequency of the remote control are used together, so you don't have to worry about losing the remote control. (If you lose the remote control, just buy one and pair it with a PCB board.)

QIACHIP 433Mhz Universal Wireless Remote Control Switch DC 12V 1CH Relay Receiver Module RF Transmitter (2 Transmitters 2 Button+ 1 Receiver 1CH)

Specifications

ASIN	B07GJT1D1Z
Additional Features	Easy to Install
Battery Type	CR2016 button battery
Best Sellers Rank	#171,581 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #659 in Garage Door Keypads & Remotes
Brand	QIACHIP
Button Quantity	2
Color	DC 12V/1 receiver + 2 transmitters
Compatible Devices	Garage Door, Electronic Gates, Other Telecommand Equipments
Connectivity Technology	Radio Frequency
Controller Type	Button Control
Customer Reviews	4.4 out of 5 stars 285 Reviews
Manufacturer	KOSEL Electronic Technology
Max Number of Supported Devices	20
Maximum Number of Supported Devices	20
Maximum Range	100 Meters
Model Number	B07GJT1D1Z
Number of Batteries	1 Lithium Ion batteries required.
Special Feature	Easy to Install

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