When it comes to personal duress alarms, there are a few factors to consider. Here are some of the key considerations:

1. Type of alarm: There are two main types of personal duress alarms – acoustic and electric. Acoustic alarms use sound waves to notify the user of danger, while electric alarms emit a flashing light or sound to attract the attention of the person being protected. Which type of alarm is best for you depends on your needs and preferences.

2. Signaling method: Personal duress alarms come in different signal methods, such as loud beeps or flashing lights. Choose the signal method that works best for you and your family members.

3. Battery life: Most personal duress alarms come with a battery life indicator so you know when it's time to recharge the alarm. Make sure you choose an alarm with a long battery life if you plan on using it frequently in emergency situations.

4. Size and weight: Personal duress alarms are small and lightweight, making them easy to store and carry with you in case of an emergency. Make sure the alarm is small enough to fit inside your pocket or bag without being too bulky or heavy.

5. Price: Personal duress alarms can range in price from less than $20 to more than $200, so you have plenty of options. Just remember, the more features an alarm has, the more expensive it will be.