Yeah it can do beep, but it actually uses the vibration motor to do it.
Note: Bangle.js 2 does not contain a piezo speaker, but instead uses the vibration motor for sound. This means that while you can get some sound, it is extremely weak
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Yeah it can do beep, but it actually uses the vibration motor to do it.
http://www.espruino.com/Bangle.js2#sound