Most product listings advertise very loud sirens, commonly in the 120–130 dB range. Manufacturers may report peak or nominal values measured under specific conditions, so check the product specification or listing for measurement details and real-world testing notes.

Many keychain alarms include LEDs with multiple modes such as flashlight and strobe/panic light. Listings frequently advertise multi-mode LED lighting (steady flashlight and strobe) alongside the siren to help signal others and provide illumination in the dark.

Some models advertise water resistance (for example IPX4) and state resistance to drops or impact, but durability claims vary by product. Review individual product specifications and testing claims to confirm the level of water protection and impact resistance for a given model.

Most listings indicate plastic construction—frequently ABS plastic for a more durable or matte finish. Material can vary by model, so check the product description if you need a specific material or finish.

Beyond the siren, some keychain alarms include backup whistles, built-in LED flashlights or strobe lights, and multi-mode LEDs that help you both signal for help and see in the dark.

Listings may offer single units or multi-unit packs. Common included accessories are installed or included batteries and attachment hardware like key rings or carabiners; check each product page to confirm what’s included with the purchase.