SABRE Personal Self-Defense Safety Alarm on Key Ring with Loud Dual Alarm Siren Heard up to 600 ft/185 Meters Away. to Use, Pull Metal Chain from BaseEasy To Use pull metal chain from device to sound 110 dB alarmSupports RAINN (the Rape, Abuse & Incest National Network – www.rainn.org)Loudest – dual siren alarm can be heard up to 600′ away (185M)Most user-friendly – sleek, modern and compact design makes alarms easy to carryBroad consumer appeal – a self-defense option for any ageKeychain attaches to backpack, purse, etc. for convenient, instant access plus greater value with batteries included