Description Made of plastic material, easy to use. Mini size, portable design, all of that make you use it more freely. It is practical for the older, children and girls and women when they have an emergency. Be it on an unfrequented street, in a dark car park or near the home, the alarm will always be on guard. Features -Material: Plastic. -Size: About4.00X3.50X2.00cm/ 1.57X1.38X0.79in. -Sound: Above 125DB. - Power supply: 3 x LR44 batteries (included). -A personal alarm keychain protects your security, just pull the keychain and sound will get you heard. - Get the help you need quickly. Commonly used by seniors to call for help in case of falling, feeling unsafe, etc. - Requires no training or skill to operate. Equipped with LED Lights, very durable and long service life. - Commonly used by physically threatened, medical emergencies, accidents, or allergic reactions. - Great gift for parents, college students, and everyone that works evenings. Wonderful defense siren key chains for women.Package list: 1 x self defense keychain