Questions about Tru Components Receiver for wireless push-button 1pc.

Hello, We've found the following PDF on the supplier's website (in German and English only, though): https://asset.conrad.com/media10/add/160267/c1/-/gl/002832827ML00/mode-demploi-2832830-tru-components-telecommande-sans-fil-industrielle-4-canaux-10-30-v-1-pcs.pdf