Made of material, easy to use. Mini size and portable design, both of that make you use it more freely. Just need to plug the latch out to make it noise, also it can be use as an simple LED light. Unique design, small size and light-weight, easy to attached to your key chain, schoolbag, belt , keys. Features -Material: Plastic -Size: About 7.50X3.50X1.50cm/2.95X1.38X0.59inch -Working voltage: 3.7 (V) -Working current: 100 (mA) -Volume: >=130 ( ) -Made with craftsmanship, strong and durable.Made with craftsmanship, strong and durable. -It can be placed in a woman's handbag, backpack or school bag or in a person's pocket. -A good self-protection option for people of any age. Cost-effective, widely used occasions. -This alarm has a rain-proof and waterproof design, which is convenient for your use. -This product is small in size, light and easy to carry, simple and convenient to use. Package list: 1 x Emergency Security Alarm