<b>High fidelity, premium quality</b><br><b>Wherever you go</b><br><br>Philips Fidelio S1 headphones are precisely engineered to deliver natural, balanced sound, revealing every details as the artist intended. Amazing sound presented in a lightweight yet durable design for true comfort and pleasure on the go.<br><br><b>Designed for precision</b><br>- High-powered 13.5mm neodymium drivers for exceptional sound<br>- Engineered metal housing reduces vibration and resonance<br>- Handpicked, tuned and tested drivers for a precise match<br>- Semi-closed back design for sound balance and bass extension<br><br><b>Listen in comfort</b><br>- Ultra-soft silicone tips in 3 sizes for a custom, snug fit<br>- Comply™ Foam Tips for superb custom fit and noise isolation<br>- Elasticized ring for in-ear stability and super secure fit<br>- Ergonomic earphones fit perfectly while dispersing pressure<br>- Lightweight aluminum housing with refined brushed finish<br><br><b>Created for convenience</b><br>- Sw This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5998-00-455-9842, indicating validated use in U.S. government and defense logistics supply chains.