When selecting a medical alert device, consider the following features: - Ease of use: The device should be simple to operate, especially for elderly or disabled users. - Reliability: Look for devices with high uptime and reliable connectivity. - Range and coverage: Ensure the device offers adequate coverage for the user's lifestyle, whether they are mostly homebound or active. - Battery life: Longer battery life reduces the need for frequent recharging. - Additional features: Automatic fall detection, GPS tracking, and health monitoring can add significant value.