Astro A40 TR plus MixAmp review: A tough sell nowadays, but still a top-notch headset | PCWorld
Replacement Microphone for ASTRO A40 TR - USA | ASTRO Gaming
Astro A40 TR Gaming Headphone with microphone - Grey | Back Market
Amazon.com: Replacement Astro 1.0M A40 Mobile Cable Cord with Both Inline Mute & Volume Control Function for Astro A40/A40 TR Also Work with Astro a10 Headset : Electronics