Mace Brand 80731 Personal Alarm Keychain (Neon Pink) Provides 130 dB of siren-like sound to disorient attacker and get attention of others; Safe and easy to use in all 50 states ; TSA-friendly for carry-on luggage; Operates with the simple push of a button; deactivation button on rear of unit; Backup whistle is built into the base of the alarm unit; Dimensions: 3 in. x 1.5 in. x .75 in.; Includes keychain and three 1.5-volt AG13/LR44 batteries; Neon Pink;