High decibel design: the alarm features a high jet alarm sound of up to 130dB. the high decibel alarm sound attracts attention and scares off criminals. Easy to use: the alarm is very easy to use, simply unplug to trigger the high frequency alarm, the sound stops when plugged inEasy to carry: made of ABS material, waterproof, drop-proof and reliable Small and portable, can be hung on a shoulder bag or backpack. Multi-functional design: the alarm comes with an LED light and can be used as an alarm or a lighting device Practical and functional, doesn't take up too much space. Wide range of applications: up to 1 hour alarm time, allowing emergency signals to be sent continuously. Ideal for people who need to work at night, e.g. nurses, women who return at night. The product is also ideal for adventurous natural or elderly people. Size: About 65*54*24.5mm Material: ABS Battery: LR44x4 (please bring your own) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.