So, you want to use two or three different walkie talkies (two-way radio) together?
There are many reasons I can think off why someone would want to do that.
To get the walkie talkies to work together, they should be on the same frequency.
If you are using GMRS/FRS two-way radio, then it should be able to work together because they all work on a range of frequency.
Since two-way radios, work on frequencies, they use frequencies as their mode of communications, to be able to see/hear another walkie talkie transmission, it needs to be the same channel regardless of brand or cost of the radio device.
GMRS/FRS (Learn about GMRS/FRS here).
So you can take two way radios of different brands and get them to work together, you can eavesdrop other people’s conversation that are different brands but are on the same frequencies. (GMRS/FRS two-way radios)
On the other hand….
High end industrial two-way radios or walkie talkies that use higher frequencies which are usually licensed to avoid interference from other radio devices cannot be used together or atleast, needs programming to be able to be used together.
You will find it difficult to use two different brands together for industrial walkie talkies
So how do you sync two different walkie talkies?
To sync to different two way radios, (two different branded devices) you simply dial them onto the same frequency or channel, set them to the same channel.
On most walkie talkies, there’s the channel number which you can set using the arrow up and arrow down button.
Press the up or down button until you have the same number set on the two devices.
Go ahead and test it out, get two different two way radios, set them onto the same channel and speak from one of them, listen to the other.