inglés al español Técnico/Ingeniería Textil / Ropa / Moda watch instructions

My take is engranajes, but I'm not totally sure as I haven't found anything with caja de cambios for an analogue watch thanks

BATTERY CHANGE
There is only one CR2025 type battery inside the watch.
This battery is used to drive both the voice announcement as well as the gearbox.
When you need to change the battery, it is better to have it changed by a trained jeweler or watch specialists.
Their training may avoid damage to the watch.