The M1942 design was a result of wartime demands. The rolled edge on the shell was eliminated, creating an unfinished edge along the rim. This edge slightly flared out, along the base of the skirt. The elimination of the rolled edge expedited the manufacturing process and reduced the amount of metal used in each helmet. Shell paint colors were typically matte grey-green (Heer) or grey-blue (Luftwaffe), and the decals were eliminated in 1943 to speed up production and reduce the helmet's combat visibility. Greater manufacturing flaws were also observed in M1942 helmets made late in the war. 
The 10C is the world’s first look at a fully integrated Bluetooth helmet communication system and HD camera rolled into one powerful device. It’s capable of full HD video (1080p:30fps and 720p:30/60fps) with MP still shot image capture and shot, burst and time-lapse photo modes. Built to handle with ease the rigorous demands of outdoor sports, motorsports, and first responders, it is the complete solution for in-helmet communication and action videography under challenging conditions.
Smooth, simultaneous use of all features
with Bluetooth ® Choose what you want to hear every time Nobody likes excessive fussing with gear while they’re riding, and the 10C Bluetooth helmet camera and communication system doesn’t ask you to, with a water-resistant, all-in-one helmet clamp design that is made for the demands of riding in any condition. Meanwhile, Sena 10C technology lets you stay focused on the rolling horizon while playing your favorite FM radio station from the built-in tuner, or piping in your favorite playlist from your MP3 player, hearing GPS directions, or listening to your buddies howling over the intercom. Switch between each of the feeds with ease, or choose just one – it’s up to you.