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I wand to control some 220V lights with 12V but don't want the noise of s normal relay. So I saw these SSR but do not understand what Low level and High level mean. Is high level normally closed or normally open? And can these be controlled only with 12v? I ask this because they say 12V, but there is a + and a - where i understand you hook up the 12V, what than is has that CH1 input where they say you have to connect 5V to. So I need 12V to operate it and 5V to trigger it?

https://www.aliexpress.com/item/Free-Shipping-Smart-Electronics-2-Channel-5V-DC-Relay-Module-Solid-State-High-Level-OMRON-SSR/32622381544.html?spm=a2g0s.8937460.0.0.816c2e0eFHD5xA

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    \$\begingroup\$ "No datasheet? No sale!" \$\endgroup\$ – Transistor Feb 21 at 23:24
  • \$\begingroup\$ The English is so poor on that link that it is hard to be confident. \$\endgroup\$ – evildemonic Feb 21 at 23:29

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