I want 6 indenpendent controlled relays. Can I set up 6 relays and transmitters so there is no cross talk?

Yes, as long as you pair the relay and transmitter separately

Does this only work with a dc power supply? one picture in the product description showed "110/240v live line" but this doesn't seem realistic.

This device is powered off 12v DC, and comprises a radio receiver and mechanical relay. It has an uncommitted set of relay contacts that can however switch any voltage, from a few volts (AC or DC) to 110v or even 240v AC. I would be careful at the higher voltages as the screw wire connectors are small and closely spaced. The relay is a compact packaged part that is energized by the on board radio receiver recognizing the unique code of the transmitter fob when it is pressed. So if you want to switch on a 60W lightbulb you would provide 12v to the receiver circuit and use the built-in relay to control the ‘live’ wire from a 115v wall socket that the lightbulb would plug into, much like a regular light switch.

Can I connect several switches to work with the same remote?

The switch will only work when the 433Mhz transmitter is pressed, so as long as the remote is transmitting the correct frequency it will operate,

Will this work for an old chamberlain/ sears opener? Guess it’s more of an opener question - I don’t know if those old openers use momentary switches

You could definitely wire something into the existing button by splicing in wires that short the leads to the botton when the relay is activated, or doing the same up on the opener if it has the typical exposed terminals. Another thing to consider is that you are going to need a 12V power supply to power this board. Those can be found for under $10 on amazon as well.

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QIACHIP DC 12V 1CH 433Mhz RF Wireless Relay Remote Control Light Momentary Switch Transmitter with Receiver (1 Relay)

QIACHIP DC 12V 1CH 433Mhz RF Wireless Relay Remote Control Light Momentary Switch Transmitter with Receiver (1 Relay)

Product ID: 150280585

Details

Brand
QIACHIP
Color
KR1201B_1
Compatible Devices
Alarm Door
Max Number of Supported Devices
1
Special Feature
Ergonomic

📡164ft max range

🔋<0.03A ultra-low power

🔧1-channel programmable relay

A$26

Duties & taxes included

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Sold byAmazon AustraliaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📡 Control Beyond Walls: Power, Precision, and Programmability in One Compact Relay

PLUG PLAY SIMPLICITY - Ergonomic design with straightforward wiring—get your system up and running in minutes.
FLEXIBLE PROGRAMMABLE - Customize multiple remotes and operating modes for tailored control over your devices.
SEAMLESS LONG RANGE CONTROL - Reliable signal up to 164ft (50m) even through walls and doors—never lose connection.
ULTRA LOW POWER CONSUMPTION - Consumes less than 0.03 amps, perfect for long-term use without draining your battery.
ROBUST INTERFERENCE RESISTANCE - Advanced RF encoding ensures stable, interference-free operation in busy environments.

The QIACHIP DC 12V 1CH 433Mhz RF Wireless Relay Remote Control Switch offers a compact, highly reliable solution for wireless device control. With a max range of 164 feet and strong signal penetration through obstacles, it supports flexible programming of remotes and modes. Its ultra-low power draw (<0.03A) ensures long-term operation without battery drain, making it ideal for industrial, security, and automotive applications.

Specifications

ASIN	B07TD8T5C5
Additional Features	Ergonomic
Battery Type	CR2032 (3V) and 12V battery
Best Sellers Rank	#33,964 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #160 in Garage Door Keypads & Remotes
Brand	QIACHIP
Button Quantity	1
Color	KR1201B_1
Compatible Devices	Alarm, Door, Light, Motor
Connectivity Technology	Radio Frequency
Controller Type	Button Control
Customer Reviews	4.5 out of 5 stars 831 Reviews
Item Weight	0.09 kg
Manufacturer	QIACHIP
Max Number of Supported Devices	1
Maximum Number of Supported Devices	1
Maximum Range	164 feet
Mfr Part Number	KR1201B_KT08_2_SET
Model Name	KR1201B
Model Number	KR1201B_KT08_2_SET
Number of Batteries	1 CR2032 batteries required. (included)
Special Feature	Ergonomic

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