The SABRE Personal Alarm is great for College Students, Moms, Runners, Seniors, Service Industry Personnel, Commuters, Nurses. Remove alarm from keychain to activate 110 dB siren. Audible up to 300" (100m). Dual siren design. Attaches to bag, backpack, keychain or purse for easy access. Security Equipment Corporation will make a donation to the Rape, Abuse and Incest National Network for every PA-RAINN-01 sold. Requires four LR41 Alkaline batteries (included).