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Dual SIM card alarm capability on Android phones


From early 2023, Crystal Alarm will support dual SIM cards on Android devices. This is particularly good news for anyone working in areas with unreliable mobile coverage, such as those in the forestry industry or working on the railways. By using two SIM cards from different mobile operators simultaneously, users benefit from a greater combined coverage area, significantly reducing the risk of being unable to raise an alarm when it matters most.


Do your employees struggle with poor signal during their shifts? Get in touch with us to get started with this feature.

Published 21 december 2022

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Beacon Tuner for Android Devices

Crystal Alarm launches Beacon Tuner for Android, an app that simplifies the installation and maintenance of iBeacons for indoor positioning. The app displays all active beacons sorted by proximity, battery level per device, and enables colour coding to, for example, identify floor levels. Battery levels are automatically synced to the Self-Service Portal. Launch is planned for April.

March 31, 2026

Crystal Button CB20 – 5,000 Units Sent with Zero Returns

Crystal Alarm announces that their new personal alarm, the Crystal Button CB20, has received a strong reception since launch — with nearly 5,000 units delivered and not a single return. The button has been designed for demanding environments such as industrial, healthcare, and logistics settings, offering a range of up to 400 metres, a five-year battery life, and an IP67 rating. The CB20 uses a proprietary communication protocol for greater reliability than standard Bluetooth, and can be integrated with the Crystal Alarm App, Wi-Fi positioning, and Cisco infrastructure.

February 22, 2026