Network:GSM: B2 B3 B5 B8WCDMA: B1 B2 B5 B8FDD-LTE: B1 B2 B3 B5 B7 B8TDD-LTE: B38 B39 B40 B41 The SOS wristband is the perfect solution to keep your loved ones safe. This simple to use safety alert wristband provides an innovative way to monitor your loved ones location anytime, from anywhere. Our SOS wristband was designed to be used for people with autism, special needs, parkinsons, alzeihmers & dementia. Reliable GPS Tracking: The tracker provides continuous all-day monitoring with a secured IoT 4G LTE cellular network. Know immediately if your loved one is lost and find them ASAP Special details include unlimited real-time tracking, customizable geofence safety areas, detailed location history, & more. Easy to Use Features: It only takes 5 minutes to activate, install, and start tracking The app will work on IOS, Android, or Windows. Our intuitive software is fully customizable, add contacts & set permissions, turn on & off features, decide what alerts & notifications you want and how to get them (Push, Email & SMS)" Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin