self defense keychain

Most listings describe simple mechanical activation: pulling a ring or removing/ pulling a pin triggers the alarm (for example, pulling the key ring, pulling out the pin, or pulling hard on the ring).

Many listings pair the siren with visual signaling—LED strobe or flashing lights are common. Some units offer two-mode LEDs (flashlight plus strobe) and list multi-hour LED run times.

Listings mention specific cell types such as 2 × CR2032 alkaline and 3 × LR41 alkaline. Some entries state batteries are included, one lists “No Battery Used,” and one listing provides runtimes (about 1 year standby, ~1.1 hours continuous alarm, and ~6 hours LED lighting).

Dimensions vary widely across listings. The smallest cited dimension is about 0.59 inches, while some larger devices list dimensions up to about 5.75 inches for at least one measurement. Exact shape and which measurement (length, diameter, etc.) differs by product.

Most listings show a package quantity of 1. At least one listing is sold as a 2-pack.