The Keychain Alarm With Light combines the two best deterrence against attack, a 130 dB alarm and a flashing light. The keychain alarm with light is activated when the pin attached to the keychain is pulled or by pressing the alarm button on the top of the unit. The keychain can also be used as a flashlight without activating the alarm to provide additional night time safety. The keychain alarm comes with two AAA batteries. Size 3" x 1".