Carry a Whistle or Personal Alarm on Your Keychain

A personal safety alarm or a simple metal whistle is louder than any scream you can produce, doesn't tire you out, and works even when you're too panicked to form words. Most personal alarms emit 120-140 decibels — enough to be heard several blocks away and to disorient an attacker at close range. They cost under $10, weigh nothing, and clip to your keys or bag. The best safety tool is the one you always have on you. A whistle also works if batteries fail. Teach your kids how to use one too — it's not just for adults.