The SENNHEISER's IE40 PRO is a in-ear audio monitoring headphones with high output and broadband frequency reproduction. They have 10mm dynamic drivers with a frequency response of 20 Hz to 18 kHz and a maximum SPL of 115 dB while maintaining phase coherency and low distortion. The compact housings are designed to be light and comfortable. They keep unwanted sounds out and allow you to concentrate on the mix with up to 26 dB of passive noise suppression. For a secure, customizable fit, swappable foam and silicone eartips are included. The 3.5mm TRS connector on the detachable 4.3' headphone wire ensures compatibility with a wide range of mobile devices.