This reliable and powerful alarm will give you that peace on mind whether you’re traveling or staying at home. With a motion sensor that triggers the alarm when someone has opened the door, it can be used in college dorm rooms, at hotels and hostels, or even at home. With two included lithium button cell batteries, it comes fully operational and ready to use. The sound intensity level of 91dB is loud enough to hear throughout the room and will startle the intruder. No one will be able to get in or out without you knowing. Additionally, the built-in bright LED flashlight allows you to see your way around in the dark without having to turn on lights. As a compact, lightweight option, it will also take up very little room in your suitcase or handbag.