The cobra mt645 two way radio high quality rugged walkie talkies with vox the cobra mt 645 walkie talkies offer durability with a slim line rugged design making them waterproofsplashproof to jis3 specification and providing an extended signal range of up to 5 kilometres 3 miles with 2662 channel combinations sophisticated featuresfeaturing voice activated transmission the cobra mt645 facilitates you to communicate easily with others whilst keeping your hands free by transmittin