Lexus Smart Key shells (also called Lexus SmartAccess or Keyless Entry/Push-Button Start key fob) is a remote keyless entry and passive keyless start system used on Lexus vehicles.
Key features
Black rectangular shell with a textured surface and a silver metal ring/key blade housing at the bottom.
Buttons (typical layout):
Lock (padlock closed)
Unlock (padlock open)
Panic/alarm (red speaker/horn icon)
Trunk/hatch release (car silhouette with open rear, present on the rightmost key)
The metal portion at the bottom usually contains a hidden mechanical emergency key that slides out for use if the battery dies or the electronic system fails.
These are the standard smart key shells for many Lexus models (especially from the mid-2000s onward, such as various ES, IS, RX, GX, LS, etc. generations).