Which of the following is a common type of portable firefighting equipment?

A fire extinguisher is a common type of portable firefighting equipment specifically designed to suppress small fires. It contains an agent such as water, foam, or dry chemical that can be directed at the fire to extinguish it. Fire extinguishers are vital tools in emergency response, enabling individuals to act quickly to control a fire before it worsens.

While other options might contribute to safety or emergency situations, they do not serve the purpose of combating fires directly. A hydraulic press is used for shaping or compressing materials, and does not play a role in firefighting. Smoke detectors are essential for alerting occupants to the presence of smoke or fire, but they do not actively put out fires. An emergency beacon can signal for help in emergency situations, but it is not designed for firefighting. Thus, the fire extinguisher stands out as the only equipment in the list explicitly intended for the purpose of fighting fires.