Audio-Technica ATH-E40 E-Series Professional In-Ear Monitor Headphonesfeatures a proprietary, dual-phase push-pull driver design that provides improved fidelity and efficiency. These headphones deliver powerful bass along with balanced mid and high-frequencies to convey the full emotion of the music, whether you're playing live on stage or just listening to music on the subway.

The ATH-E40 features a specially engineered housing that is designed for improved isolation from outside sound. Isolation and comfort are enhanced by the four sizes of included silicone eartips (XS/S/M/L), which allow you to create a custom fit. The headphones also come with a detachable 5.2' (1.6m) cable and a carrying case.

FiiO A1 is a portable headphone amplifierwith volume control, hi-fidelity output, and four EQ modes providing maximum flexibility. It can be used for smartphones, computers, tablets, iPods, and MP3 players to increase volume and deliver a more satisfying experience when listening to audio.

Featuring a sandblasted aluminum-alloy chassis, the portable amp uses a rechargeable lithium-ion polymer battery for power and weighs only 0.7 ounces. The four different EQ modes are switchable by briefly pressing the power button. A blue LED flashes to indicate each mode as it is selected.

Furthermore, there is a 3-color status LED to help you monitor the power condition of the unit, which flash differently for power on, charging, low battery, and full battery status. Finally, the tiny size of the A1 portable headphone amplifier makes this a great choice for adding that extra punch to your audio listening experience.