These compact devices are ideal for runners, commuters, and students who want to minimize their vulnerability while traveling. VIGOROAD Safe Sound Personal Alarm 5. No low-battery indicator. However, this watch fits in some other useful features to reassure you of your loved ones wellbeing. Personal safety alarms can have changeable batteries or internal batteries with a limited lifespan. *Product prices and availability are accurate as of post date and are subject to change. Thats painfully loud for most people and just a little quieter than a jet engine. The Taking Care Out-and-About Alarm Watch is a personal alarm, GPS location tracker, activity monitor and more in a the package of a discrete personal alarm watch. This could make it easier to accidentally activate the alarm, particularly if youre around small children. While the battery is designed to last for up to 5 yrs., it isn't rechargeable or replaceable.