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 Armors||Mark I | Mark II | Mark III | Mark IV | Mark V | Mark VI | Mark VII | Mark XLII|
|Iron Legion||Mark VIII | Mark IX | Mark X | Mark XI | Mark XII | Mark XIII | Mark XIV | Mark XV | Mark XVI | Mark XVII | Mark XVIII | Mark XIX | Mark XX | Mark XXI | Mark XXII | Mark XXIII | Mark XXIV | Mark XXV | Mark XXVI | Mark XXVII | Mark XXVIII | Mark XXIX | Mark XXX | Mark XXXI | Mark XXXII | Mark XXXIII | Mark XXXIV | Mark XXXV | Mark XXXVI | Mark XXXVII | Mark XXXVIII | Mark XXXIX | Mark XL | Mark XLI | Mark XLII|
|War Machine Armors||Mark I | War Machine prototype | Mark II | Iron Patriot|
|Related Armors||Iron Monger | Whiplash (Mark I • Mark II) | Hammer Drones|