Topping TP30 MARK2 MK II USB DAC Headphone Amplifier The new generarion from TP-30: TP30 MKII.It is not only a DAC , but also an amplifeir& headphone amp. The new TP30 MARK2 support ON/OFF via USB. TP30 MARK 2 also have enhancement in Android support, it can fully support Android Mobile Device 4.1 or above with OTG connection(Only for Native Android system with OTG function). All in one machine with Desktop Hifi, PC-Hifi solution.