Feature: 1. High Decibel Alarm: This personal alarm has a loud sound and with LED lights, can quickly attract the attention of those around you. 2. Durable One Piece Structure: The alarms are made of ABS material, and each alarm has been tested for high impact resistance and durability, and can withstand falls. 3. Light and Portable: The security alarm key chain is small and portable, with a firm mountaineering buckle, can be carried around, added to the key chain, backpack, school bag, bag. 4. Easy to Use: Just pull the latch from the top of the alarm to send an alarm. If you want to close, plug the latch back, the elderly, children use it easily. 5. Multifunctional Application: The alarm can not only be used to protect personal safety, but also can be used as a regular emergency alarm. Suitable for students, female to protect themselves. Specification: Item Type: Personal Safety Alarm Material: ABS Size: Approx. 10 x 3 x 2cm/3.9 x 1.2 x 0.8in Battery Type: Button Battery Battery Model: LR44 x 3 (Shipped with built in battery) Battery Capacity: 480mAh. Package List: 1 x Personal Safety Alarm1 x Accessory 1 x Manual Note: Shipped with built in battery