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: Built-in 4G LTE support for real-time tracking and voice calls without needing a constant tether to a smartphone.

: Many models are waterproof (often rated IP69K or up to 50m), making them safe for use in the shower—a critical feature for elderly users at risk of falls in the bathroom. Troubleshooting the "SOS Work" Issue allupgrade aml920 4g 512m none sos work

The "4G 512M" designation typically refers to the device's core communication and memory capabilities: : Built-in 4G LTE support for real-time tracking