HarmonicDyne Helios Headphones, Upgraded Silver FiiO Cables, 3.5mm, Bal Adapters, two extra pairs of ear pads (micro-velvet & sheep leather). These are in great shape and come in their box with multiple extras noted above. Redefine High Definition Performance The Helios presents incredible dynamics within the form factor of open-back headphones. Designed to replicate the sonic properties of an acoustic treated recording studio, the Helios delivers unparalleled tonal balance, shining every detail of every song at both high and ultra low frequencies. HaromonicDyne Helios - your solution to maximum high fidelity audio, wherever you go. 50mm Custom Dynamic Drivers - Engineered for Acoustic Accuracy Equipped with a new and innovative custom 50mm composite diaphragm dynamic driver, the Helios offers an extreme frequency response of 10Hz to 40kHz. Going beyond the audible range of the human ear, the dynamic range of the Helios ensures you will never miss any details of any song. Ultra-High Resolution Audio - Music You can Reach Out and Touch. We wanted to present a sound that was both accurate, and musical. We tuned the bass to be very precise yet deep enough to leave a satisfying rumble. The speed of the bass allows our transparent mids to shine through for those smooth vocals. The trebles shimmer like crystals and presents a detailed, while enjoyable, listen. Thanks to its 16 Ohms impedance, you can easily pair the sonic performance of the Helios with any device. Open-Back Design - The Most Authentic Musical Experience that You Will Experience. As its name suggests, the HarmonicDyne Helios presents a natural, detailed, and balanced sound that allows you to feel an incredible connection and transparency to the music. The power of our new custom drivers, matched with our expertise tuning makes for an amazing sound. Add this to the custom driver cavity and open-back design, and you’ve got acoustics that can parallel any studio recording room! Escape from your daily routines and engross yourself in the music. Elegant Design for a Graceful Sound - Solid Walnut Wood Construction Reinvented elegant design-Durable design with walnut wood and SUS304 Stainless steel mesh empty design . The sound cavity has been carved out of one piece solid walnut wood to create a acoustic chamber that resonates with luxurious timbre. We specifically chose solid walnut not only because of their beautiful appearance, but because walnut wood is known for is Mahogany-like warmth in the mids with the punchy and resonant bass like that of rosewood. The mesh is constructed of SUS304 stainless steel to allow open flow without compromising on the integrity of the construction. The Helios is a true marriage of stylistic design and optimal acoustics. The Perfect Fit - Optimum Comfort for Hours of Listening Pleasure . Designed with the highest-quality materials for the metal headband and sandwiched with several layers of resonant dampening polymers, you’re ensured with a secure fit and cloud-like comfort. The lightweight and softbuild design means your long listening sessions will be pleasurable - without the pressure. Ergonomic Ear Pads - Comfort meets HiFi . The innovative and ergonomically designed ear pads are crafted of high quality nanometer leather cushions, an ultra-lightweight and ultra-comfortable material that makes for a comfortable wear. Its geometric inner membrane design ensures a perfect seal for those tight basslines, while permitting airflow so your ears don’t get too stuffy. Custom Balanced Cables . We chose to use ultra-high purity copper wires for our cable to enhance the rich mids and punchy bassline. The balanced cable also means you can benefit from the extra voltage of your desired digital source. One upgraded cable is also available to upgrade your sound to another high level. PRODUCT SPECIFICATIONS Drivers 50mm German-Engineered Dynamic Driver Technology custom composite dynamic driver Impedance 16ohms THD <1%(1000Hz, 1mW) Cable length 2 meter Weight 360g without cable Raw material walnut wood Plug type 3.5mm