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Sonoff RFR3 - Numbers learning RF remote button (433)

Hi, anyone know how many learning RF remote buttons for the Sonoff RFR3


(perhaps 14 ? same as RF2)


I ask because the RF "first version" can only learn one remote, same also Sonoff 4CH pro R2 (extra question : Can be possible to upgrade something to learn more than one RF button?)


Thanks.

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