This is a car key shell(also called a remote keyless entry transmitter or smart key remote).
It is a wireless remote control that communicates with your vehicle via short-range radio signals. Pressing the buttons locks/unlocks the doors, opens the trunk/hatch
Button functions
Button
Closed padlock
Lock – locks all doors and usually arms the alarm
Open padlock
Unlock – unlocks the driver’s door (or all doors); a second press often unlocks the rest
Car icons (one appears to show an open rear/side area)
Commonly trunk/hatch release, power liftgate, sliding door, or similar convenience functions
Trunk / rear hatch open (or power liftgate control)
It usually contains a replaceable battery (often CR2032) and may house a physical emergency key blade that slides out of the side or bottom