Why can you hear yourself through astro a40?

You can hear yourself through Astro A40 headphones due to the built-in microphone and the mix amp's monitoring feature, which allows you to hear your voice through the headphones while speaking. This is often referred to as "sidetone" and helps you maintain a natural speaking volume and awareness of your surroundings. Adjusting the sidetone level can customize how much of your voice you hear in the headphones, enhancing communication during gaming or calls.