The Safariland® REDLINE™ series of military-grade, tactical communications equipment was created specifically for the fire and rescue industry and includes the REDLINE™ FSM (Fire Speaker Microphone). The REDLINE FSM is a stand-alone, primary radio communications accessory designed to allow firefighters to communicate effectively in a thermal environment. Sealed for water spray protection and purpose-built for the safety of firefighters, this speaker mic is ergonomically designed to be used with a bulky, gloved hand.