Whether you are living in a secluded location or just don't want to get attacked, a personal panic alarm can be an effective tool. These devices work by emitting a loud siren when activated, which can scare off attackers and alert bystanders nearby.Sound: Most personal alarms are capable of producing a sound that is more powerful than a human scream, with some even able to produce an ear-piercing 140dB. That's on par with the noise a police siren makes, and enough to scare off an assailant.Compactness: Ideally, an alarm should be small enough to fit in your pocket, purse or on your wrist. This makes it easier to hide, which means you'll be less likely to be spotted by an assailant.Battery life: Make sure the batteries last for a long time, especially if you're planning on taking your alarm with you on a trip or when you go out on a night out. It's also a good idea to find one that is easy to replace when it runs out of power.Safety Features: Look for a personal alarm with safety features like an LED light, strobe or a glass breaker. Having these features can help you escape in a crowded car, or slam the device into a window to break it open from the inside out.Some personal panic alarms also have built-in GPS devices that can provide detailed information about your current location. lone worker alarm This can be a big help when you are traveling alone or if you have a problem with wandering or straying away from home.