The gearbox is ineffective for acute noises, for against works great for low frequencies! Subway noises are almost completely removed, I can listen to my music at a sound level much lower than before, and I want a lot better. Very good battery life (I'm still on the same cell after a few months of daily use). I have made it 4 stars because-despite the forceps, the small box does not take very well and sometimes embarrassing. Overall very good value for money, I am very satisfied and would recommend to anyone using metro / bus / tram
