Many personal alarms advertise siren levels around 120–130 dB. Listings report audible ranges of roughly 600 ft (180 m) up to about 1,300 ft (395 m). These figures reflect advertised performance on product listings.
Most personal alarms use a pull-pin or key-ring trigger that sounds when the pin is removed. Some security-style alarms (for example, bike alarms) use remote controls to arm and disarm the unit.
Many personal alarms include LED lights with modes such as steady-on, strobe/flash, and a separate flashlight mode. A few listings specify both flashlight and strobe functions.
Some personal alarm listings show IPX4 or IP65 ratings. Others describe weatherproof or sweatproof designs intended for outdoor activities.
Personal alarms commonly include built-in key rings, clips, or carabiners so they can attach to keys, bags, belt loops, or clothing for easy carry.
Bike-style vibration/anti-theft alarms often offer multi-level sensitivity and volume settings (for example, seven sensitivity levels) and may include SOS or tilt-detection modes.
Listings describe personal alarms used for running or walking at night, travel, hiking, camping, luggage/trailer/fence security, and as an emergency signal in medical situations.
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