With Westone’s exclusive SLED technology, you are in control of your musical environment. Enjoy full-range frequency response from your in-ear monitor signal, hear and feel your surroundings, and engage with fellow performers and your audience like never before. Recommended for on-stage monitoring and band practice. Proprietary design produces the most accurate and detailed sound in the world. Left and right earpiece responses are matched to a +/- 3dB tolerance.