Listen to whether the fire tone is high pitched or not. Fire alarms with high pitches are often used in homes to alert occupants of a fire or something smoking in the premises. Extinguish small fires that are not spreading using a fire extinguisher. It is often located somewhere in your kitchen or in another designated area.
Look for a blinking light. Although this is not an audible tone, blinking lights can also be fire alarms. They are used in large public spaces such as shopping malls to alert you of a fire or smoke in some part of the property.
Listen for any other type of loud, sustained alarm. The sound may vary depending on the fire alarm system installed. For example, you may hear a loud bell, a siren or another disturbing sound.