FIR Audio Krypton 5 Universal In-Ear Monitor OPEN-BOX The front panel knob adjusts

The front panel knob adjusts the volume of the headphone output

the other filters are on the included storage sheet

AB-1266 Phi TC Headphone

Sealed-back ear cup construction with incredible Bordeaux lacquer finish

The straight earphone plug would be in the way

FIR Audio Krypton 5 Universal In-Ear Monitor OPEN-BOX The front panel knob adjustsKrypton 5 The pinnacle of 5 driver portable sound. The Krypton 5 is a technical performer with outstanding quality and clarity. Handling each note, instrument and layer with delicacy and care. Snappy impactful bass forms the backbone to the Krypton 5s textured presentation. Making for a crystal clear, enjoyable audiophile IEM. The Krypton 5 features machined aluminum shells, sapphire crystal glass faceplates, is outfitted with 4 balanced armature