What is the ruling on the remembrance-of-Allah device that is installed at the entrances of shops and pharmacies and reminds those entering and exiting to say: "Remember Allah" or "Send blessings upon the Prophet"?

We hope there is no harm in using such a device, for it is of the nature of enjoining remembrance (dhikr) and encouraging it, and alerting from heedlessness. It falls under the verse: {And remind, for indeed, remembrance benefits the believers} (Quran 51:55), and it is a form of cooperation in righteousness and piety.