Review on DROK 180047 High Conversion Efficiency Power Converter Step-down Female USB Adapter 12V to 5V - Max 3A/15W Output for iPhone/HTC/Nokia by Keith Saywon

All right. ADVANTAGES: - no software required - Windows capable - does what it says on the tin. Turn up the volume. One touch mute. The large size of the button allows you to quickly mute the sound. CONS - not ergonomic. Very large handle, requires either one finger or the whole hand to rotate. - it takes a few full revolutions to go from zero to 100, that's a lot of revolutions. - no volume display on the handle. - Slipping on the table. - The cable is fixed. For shorter or longer cables, it is better to use a plug. RECOMMENDATIONS:- ** Fine control 0-100 (like most amps) **:- Smaller control.- Detachable cable.