L&B Bluetooth Audible Altimeters.

Discover the power and precision of Larsen & Brusgaard Bluetooth audible altimeters! In this video, we take a closer look at these high-performance devices designed for skydivers. Learn how their Bluetooth connectivity enhances your experience, offering seamless integration with other devices and ensuring accurate, real-time altitude alerts.

You can find these and the non-Bluetooth Audible versions at the links below:
https://www.chutingstar.com/skydive/altimeters/audible-altimeters?manufacturer=Larsen+and+Brusgaard

Needing batteries for these things?
https://www.chutingstar.com/cr2325-batteries-for-solo-viso-optima-quattro-ares-protrack-ii-ares-ii

Why is it so important to use the batteries recommended by L&B for their units?
https://www.youtube.com/watch?v=lh49p4zJzgU&list=PLRgp92ptN0_09zM9VFn5EUnbs8KcrCYbb&index=12