[LOUD 130DB SAFESOUND ALARM]: With ear-piercing sound to attract the others' attentions even 300 yards when you are in danger. Up to 50 minutes of continuous sound to emergency use. It will replace self- to protect your safety, as . [RECHARGEABLE BATTERY]:Built-in a rechargeable lithium battery (not button battery). Don't need to replace the battery, directly use the usb data cable to charge and charge time is only 30 minutes. [TWO WAYS TO OPEN ALARM]- Personal safety alarm siren have two ways to use in case of emergency or need help, pull up the self- keychain alarm, the personal alarm will sound, inserting it to stop; double press the SOS button will also open the alarm, long press to stop. [Upgraded BRIGHT LED LIGHT]The LED emergency flashlight of self keychain is bigger and brighter than traditional security alarm, light time 75 min,flash time 5.5 hours; uses environmental and durable recyclable ABS material, IP44 waterproof resistance. [SUITABLE FOR ALL]: Self alarm can be attached to purse, backpack, keys, belt , and suitcases. It also can be brought onboard a plane, really convenient, fit for Students, Joggers, Elders, Kids, Women, Night workers. colour: blue Material: ABS+PC size: 70x36x17mm Package Contents: 1 x Alarm 1 x USB charging cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.