The ER3XR-LE Extended Response Earphones from Etymotic offer an enhanced and extended bass boost for those listeners that prefer a stronger low-end response. They deliver good sound reproduction for portable media players with a 1/8" output—MP3 players, recorders, CD players, and more. This model includes a Lightning adapter, making the earphones compatible with many iOS devices.

The earphones are built with high-performance, balanced-armature micro-drivers and have a frequency response of 20 Hz to 16 kHz. They offer 35 to 42 dB noise isolation and include an assortment of ear tips for proper seal and comfort. A detachable 4' cable, shirt clip, carrying pouch, filter-removal tool, and replacement filters are also included.