Personal alarms in these listings commonly advertise very loud outputs. Handheld personal sirens typically list about 120–130 dB, while some bicycle/anti-theft alarms and smaller units report lower values (around 113 dB).
Many personal alarms combine a loud siren with LED lighting. Common options include strobe/flash modes, steady LED illumination, and a flashlight mode; some units offer multiple modes such as always-on, slow flash, and fast flash.
Some listings include formal ingress ratings and weather-resistant descriptions. Examples in these results include IP65 dust/water resistance and an IPX4 waterproof rating; other items are described more generally as weatherproof or sweatproof.
These alarms are often multi-purpose. Listings mention uses such as bicycle or motorcycle anti-theft, luggage or trailer alarms, window/fence alarms, and sporting or outdoor signaling (boating, camping, hiking) using horn-style devices.
Common activation methods include pull-pin or pull-ring triggers (typical for keychain alarms), push-button or top-button triggers (for horn-style or handheld devices), and vibration or remote-arming features used in some anti-theft bike alarms.
Detailed runtime information is uncommon, but one listing provides specifics: continuous alarm sound about 1.1 hours, LED lighting up to 6 hours, and a standby time of about 1 year. Other listings use general terms like 'long-lasting' without exact runtimes.
Common carrying and mounting options include built-in key rings or pull rings for keychains, clips or carabiners for attaching to bags or clothing, and for anti-theft or bike alarms, adhesive mounts or cable-tie brackets plus remote fobs for arming/disarming.
Volume levels in these results range from around 113 dB for bicycle anti-theft alarms up to about 130 dB for horns or personal sirens; many handheld personal alarms list levels in the 120–125 dB range.