Control 2 devices from 1 channel?

From a I3 a want to control 2 different Shelly 1PM from the same button. Is this possible? Channel 2 and 3 will not be in use here.

For now i use standard 192.168.x.x/relay/0?turn=on command to turn on light on one buliding but i also wanto to turn on light simultanously on another building without using a second button.

I don't use cloud.

Cheers, Marcus

Tnaks

There is no Add button on the i3 i'm afraid.

Well, fresh out of the box and i i never get the question to update. And yes, it have internet access with correct gw and dns.

The current Firmware version of your Shelly device is 20200421-183805/master@d834f204 No newer firmware available.