Noontec Hammo GO Noise Cancelling Over-ear Headphones For Audiophiles Pure Sound Quality, Durable, Foldable & Fashionable Stereo Headphones ACTIVE NOISE-CANCELLING HEADPHONES CRAFTED FOR AIRPLANE PASSENGERS (Wired, NO bluetooth function). Hammo GO utilizes unique active noise-cancelling technology from Noontec, which reduces airplane engine noise by 90%, lower frequency noises like human sound can not be reduced. Hammo GO is equipped with an audio adapter that can be connected to the in-flight entertainment system for use. COMFORTABLE TO WEAR AND SUITABLE FOR LONG FLIGHTS. Hammo GOs earmuffs are hand-made of protein cotton and specially optimized to fit the head, providing users with 7-8 hours of comfortable wear---ideal for long-haul flights. ULTRA LONG BATTERY LIFE. Hammo GOs battery provides up to 60 hours of continuous work time. Hammo GO uses two AAA dry batteries, which can be easily replaced at airport retail stores. THE ONLY NOISE-CANCELLING HEADPHONES WITH HIGH-FIDELITY SOUND QUALITY. Hammo GO provides the best of noise-cancelling technology and the best of high-fidelity sound quality. This is created by Noontecs unique SCCB technology and 50mm HD Votrik driver. Hammo GO is the only pair of headphones on the market that is equipped with both functions of active noise-cancelling and high-fidelity sound quality. PERFECT FOR TRAVEL. Hammo GO can be folded to save space by 50%. Hammo Go also includes a carbon fiber carrying case, which is not only portable but prevents damage during travel. Hammo Go can be used on iOS and Android devices.