... ,Emergency and Chemical DefenseMore details as below:1.Durable and portable,Specially for the Helmet,unique design wearing in shoulders and ... integrated, make it easy,portable and convenient.Suitable for working in half-open or closed helmet ,face cover or mask,and using by ... us know. Walkie Talkie Helmet Headset PTE-119D durable and portable,suitable for working in half-open,closed helmet,face cover ...