More and more newer smartphones are being made without an analog output, resulting in having to use a dongle for wired listening. Problem is most USB-C to 3.5mm dongles aren't all that good performance-wise, which makes getting a portable dac amp all much the better. Portable dac amps range from full size desktop solutions to very small ones like the Hidizs S3 Pro, which has a footprint comparable to a microSD card and supports mic input (not all dacs do). The Hidizs S3 Pro has no buttons so, it's a "plug and play" device in the truest sense of the word. The S3 Pro has an aluminium alloy gun metal finish construction made with a CNC injection moulding machine. The front and back panels are textured with circular grooves like an LP record, while the perimeter has a smooth, matte finish. The Hidizs S3 Pro is 1cm thick with a 2cm diameter size. The S3 Pro amp dac is attached to a USB-C metal plug connector via a 5cm long cable. Total length of the S3 Pro (including the ...