Vigilant PPS22BL 130dB Panic Rape Emergency Alarm Keychain + LED Light for $14.99

The PPS22BL is designed to look like a car remote to disguise it from potential attackers. It features a 130 dB alarm (the same dB level as a jet plane at 100 feet). Simply pull the pin, and this ear-piercing alarm will activate for up to a half hour of continuous sound. Activating the alarm switches the element of surprise from the attacker to the potential victim.