If you have a common timer/relay model, here is what the manual usually explains:
Tap. Tap-tap. Tap.
If the device does not respond, try the next code for your brand. Sometimes the first code in the list does not work, but the second or third one will. zn-401s manual
Specifically, it listened to machines.
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If you are operating your Cable box but want the Volume keys to adjust your TV speaker instead without changing modes, you must re-program that specific device code directly to sync audio across devices. Performing a System Factory Reset "suggestion":"ZN-401S firmware update instructions"
: Ensure the battery polarities match the internal layout markings (+ to +, - to -).