These goods are TW, pretty and all, but ..... I use it as part of my work, I am driven to move around in different buildings spaced 800m maximum. The reception is already beginning to be rather weak (microwave, electric lines are definitely the cause) but remains correct if I do not move too much, but when I'm moving vehicle, it becomes even harder, it does not I have to be a next to power lines. or other ............ Anyway, they are of good quality, and I am convinced that more adequate use than mine, they will meet their owner.