Easy to Use - Pull the keychain out to activate it. The strobing flashlight and the piercing sound will go off continuously until deactivated by pushing the keychain back in.This safety keychain is small and easy to carry around with you wherever you go. It’s perfect for attaching to your keys, backpack, purse, or luggage. Protect Your Valuables -The vibration alarm feature that alerts you when someone enters your hotel room without your permission or touches your valuables when you are away.When you are on a business trip, hang it on the hotel door handle. If someone enters the room without your permission, it will immediately trigger the sound and light alarm function. If you travel alone and need to leave your valuables temporarily, you can hang the product on your valuables. If someone secretly touches your valuables, the product will immediately emit a sound and light alarm.Flashlight- it can provide a uniform high-brightness beam and a wider range of illumination to meet your daily needs. How to set up anti-theft mode: Press the function button on the alarm device 【three times】 and there is a LED flashing in green for 【10 seconds】, the device will enter vibration mode,When attached to a door handle, bag, or luggage, 【any movement or touch】 will trigger a super-loud alarm with flashing lights, 【alerting you and protecting your belongings】The alarm will sound for 20 seconds, then automatically re-enter anti-theft mode.The device will operate in this cycle 【until the battery dies】. How to close anti-theft mode: Press function button in 3-time,The led light is not on,it's turn off. Suitable for everyone - Smart and convenient device that can help you feel safe and secure wherever you go. It has a dual function of sound and light alarm that can scare off any potential threats and attract attention from others SUITABLE FOR EVERYONE - Smart and convenient device that can help you feel safe and secure wherever you go. It has a dual function of sound and light alarm that can scare off any potential threats and attract attention from others.This safety keychain for women self defense alarm is also used by seniors to call for help in case of fall, medical emergencies, accidents, or allergic reactions. Great gift for parents, college students and everyone that works evenings. Wonderful defense safety keychain for everyone. Battery - USB Rechargeable li-ion battery and last up to 3 months on a single charge. Can be used as a door stop alarm and door stopper, Its high damping rubber bearing can prevent the door sliding and prevent the bad guys into.USB charging with rechargeable standby time 5-7 day,Easy to use by everyone for travel,home,hotel,anti-theft vibration sensor siren