What happens when the battery is drained?

The user can purchase a coin-cell CR2430 Li-ion battery from a recognized supermarket or from us. After which the user can replace the battery with the new one.

Difference between Muse Grandeur and Muse Minimo?

Grandeur has a multi-layered premium dial and has sapphire coated mineral glass along with NFC present whereas Minimo has a single-layered flat dial with mineral glass without NFC ( Can be bought as an add-on).