Radnor 54Vi Variable Shade Auto-Darkening Helmet Features: Narrower 5 1/4 X 4 1/2 format with 2 independent sensors.Viewing area equal to 7.25 sq. in.Outside command center with infinite shade range of 7-14, sensitivity adjustment and grind modeInternal adjustment for 4-mode delayIndependent arc sensors HELMET AUTODARKENING 54VI VS 7-14 JETSTAR RADNOR COBRA.