Similar to the Mark III's, this chin-mounted device seemed to allow Mr. Stark to use local cell sites for wireless communications. It also included a loudspeaker as well as several individually-calibrated directional microphones, which Stark used to pick up exterior sounds.
Stark previously weaponized his RT chest piece in the Mark III by externalizing its light energy into a powerful beam. The thermoplastic lens used to focus the beam's energy was modified for the Mark IV with a variable prismatic shutter that allows Stark to control the beam's intensity.
|Iron Man armors|
|Primary Iron Man Armors||Mark I | Mark II | Mark III | Mark IV | Mark V | Mark VI | Mark VII | Mark XLII|
|War Machine Armors||Mark I | Mark II | Iron Patriot|
|Related Armors||Iron Monger | Whiplash (Mark I • Mark II)|