Denon AH-D400 is a headphone launched by Tianlong, which belongs to Urban Raver series. The most special feature of Denon AH-D400 is that there are two knobs on both sides to control LED brightness and switch, as well as the wire control function. The most special thing is that the knobs on both sides have light circles, which are quite cool. It adopts 50mm sound generating unit, integrated power amplifier, and low frequency stability. Denon AH-D400 is currently at a low price of 79 US dollars, about 490 yuan, and the received price is 780 yuan. The pace of domestic goods is 2500~3400, and the price advantage is very obvious.