Check the listing for details. MSA Gas Mask Voice Amplifier Millennium / Advantage – Tested & Working. Condition: New – Open box. Listed at 180.00 USD. The MSA Gas Mask Voice Amplifier is a reliable and tested personal protective equipment designed to enhance communication while wearing a gas mask. With the trusted brand of MSA, this product ensures clear and amplified voice transmission, making it essential for various industrial and safety applications. Whether for facility maintenance or protective measures, this gas mask voice amplifier provides a crucial communication tool for those in need of personal protective equipment.