The FH-100A is a portable firefighter's telephone handset designed for emergency two-way voice communications across life safety networks. Constructed from durable red ABS plastic, it is equipped with a flexible coiled cord and a male phone plug. When plugged into wall-mounted FJ-100P telephone jacks installed throughout building floors and stairwells, it enables firefighters and emergency responders to establish direct communication with the main control panel or emergency voice evacuation system.