Final answer:
The riddle describes an emergency flashlight, commonly found in vehicles and buildings for use in emergencies. It is activated by pressing it to provide additional light.
Step-by-step explanation:
The riddle you’re referring to seems to be describing an emergency flashlight (EFAP) that can be found in airplanes or other transportation vehicles, or in buildings as part of emergency preparedness kits. If you find yourself in an emergency situation in such places, you're advised to “depress” or press this device to gain additional illumination. These devices are designed to be reliable and easy to activate in stressful or difficult situations.