A40 TR Mod Kit Adapt the ASTRO A40 TR headset to any environment by adding an ASTRO A40 TR Mod Kit. For loud environments such as pro tournaments, one can transform the A40 TR to a closed-back noise-isolating headset with sealed Speaker Tags, synthetic leather ear cushions and headband, and a voice-isolating microphone. Please note: A40 TR Mod Kits are only compatible with A40 TR Headsets and not any other headsets. COMPATIBLE WITH A40 TR HEADSET Mod Kits work only with A40 TR Headsets, made for tournament environments and team gaming houses where background noise can become a distraction. VOICE-ISOLATING MICROPHONE Eliminates background noise and focuses on only your voice for optimal team communication. CLOSED-BACK SPEAKER TAGS Adds a silicone baffle to transform the A40 Headset from open-back to closed-back, sealing off the outside world so no sound leaks in or out. CUSTOMIZE YOUR LOOK Mod Kits add color and style to the A40 TR Headset, working with both black or white models. PADDED HEADBAND Synthetic leather headband for added comfort and style. NOISE-CANCELLING EAR CUSHIONS Synthetic leather cushions greatly improve passive noise isolation.