I have a set of SilverCrest IP20 remote controlled sockets purchased in LIDL.

Remote: SilverCrest 113854 RCT DS1 AAA-A 3726
4x Switches: SilverCrest 113854 RCR DS1 3711-A IP20 FR 3726

These work on 433Mhz radio frequency, so the switches can be controlled using my Raspberry Pi instead of the remote control which came with the set.

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