Stable Monitoring and Detailed SoundInstead of your everyday pair of wired earbuds, Sony’s IER-M500 is a professional in-ear monitor. Designed with feedback from professional monitoring engineers and intended for musicians and performers working in an environment where the audio need to be consistent and fit securely as they move around the stage, the new model utilizes a 5mm dynamic driver.Its driver supports a frequency range of 10Hz-40,000Hz and it works together with a sealed acoustic structure, which Sony claims reduces the intrusion of the outside world. Coupled with the acoustic structure, it’s designed for controlled low end and clean high frequencies with the ability to accept High-Resolution Audio, it’s ideal for users who favor wired listening and want crisp audio reproduction.Fit and Durability Designed for Extended UseSony clearly placed a lot of emphasis on the fit and feel of the IER-M500 when moving. These IEMS use soft ear-hangers and five fitting supporters and four sizes of sound sealing tips ensure you can customize their fit to your liking. Sony claim the fit can withstand sweat and humidity during long uses which they deem a critical point for artists and athletes.Included is a cable clip and storage case and also obvious left and right markings aimed at getting the headphones connected in dark studios.The Y-shaped 1.6m cord has a mini jack L-plug at the end and also boasts a connector that is designed for regular use by a professional.Sony IER-M500 Key SpecificationsSpecificationSony IER-M500TypeWired in-ear monitorDriver5mm dynamic driverAudio supportHigh-Resolution AudioFrequency response10Hz–40,000HzImpedance16 ohms at 1kHzSensitivity103dB/mWAcoustic designSealedCableApprox. 1.6m Y-typeConnectorL-shaped stereo mini plugWeightApprox. 6.9g without cableFit accessories5 fitting supporters, 4 ear-tip sizesAdditional accessoriesCable clip and carrying caseA Premium Wired Alternative in the Wireless EraThe release also signals Sony's apparent intent to continue in wired listening even as the mainstream embrace wireless and true wireless stereo (TWS) earphones. In a similar vein to its more audiophile focused earphones like the WM1a Walkman, Sony eschews batteries, Bluetooth connection, and active noise canceling, putting the IER-M500's appeal on their construction weight, passive noise cancellation, stable fit and high-resolutionwiredlistening.