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Ultra High Frequency (UHF) 403-470MHz
Electronic audible and visual low air flow indicator
Built-in directional microphones that amplify range commands and other ambient sounds to a safe 82dB
Low battery level & auto power off (if not used for 4 hours)
Ergonomic and adjustable head suspension
3M™ SecureFit™ X5503V-CE Vented Safety Helmet - Pack of 4 s333lg Ultra High Frequency (UHF) 403-470MHzKey Features Secure, comfortable head protection against small falling objects and for general industrial use Suspension system incorporates exclusive patented 3M Pressure Diffusion Technology 4 point ratchet suspension allows wearer to customise height and fit with multiple levels of vertical adjustment Vents allow airflow through the helmet Optional vents allow airflow through the helmet Inspired by climbing helmets with a brimless design to give
