Welcome to my shop! Features: 100% new retail. It is the personal alarm that can make loud sound up to 130dB to draw other's attention to protect you from danger when you have an emergency. It is suitable for people at all ages such as students, elderly, children, women, night workers and so on. Made of high quality ABS material, this product is lightweight and durable to use. The length of the product is 6.4cm, the width is 4cm, and the height is 2.15cm. You can use this alarm very easily. Just pull the metal pin out of the personal alarm, the alarm sounds immediately, push the pin back in and the alarm switches off immediately. When you press and hold the switch, the LED lights up, when you release the switch, the LED turns off. Item Name: Security Alarm Battery: 3 x LR44 Button Batteries(Included) Volume: 130 Decibels LED lighting Time: 24 Hours Standby Time: 8-12 Months Long Ring Time: 1.5 Hours Features: Self Defense, Mini, Portable Material : ABS Size Details: 6.4cm x 4cm x 2.15cm/2.52" x 1.57" x 0.85" (Approx.) Warm prompt: Transition: 1 inch= 2.54cm, 1cm=0.39inch 1.Please note that there is a little discrepancy between the picture and the actual item. 2.Please check the size in the picture before you buy it. 3.The color of the item may vary slightly due to the light and the screen, pls understand it. 4.May Exist 1-3cm error of measurement! Package Includes: 1 x Security Alarm