AUTOKING Iron Man MK5 1:1 Helmet Wearable Voice-control Mask Halloween Cosplay. Height: 62 cm / 24.4 In. Item needs AA(1.5v)battery 4? AAA battery 2 (Without battery, the battery cannot be sent internationally). Note: If the AA battery power is lower than 1.5V, it may lead to slow response of the helmet, poor eyes and other problems. Helmet can be controlled by voice like the instructions below. Size :Wearable within 60cm head circumference. Touch The Sensing Area Of The Right Ear: Control The Mask Multi-chip Open/close. Touch The Left Ear Sensing Area: Control The Mask To ...