Westone AM Pro30, Universal In-Ear Earphones, SLED technology for the isolation of ambient noise, Suitable for live use and tape rehearsals, Three-way, Passive crossover, Frequency range: 20 - 18,000 Hz, 124 dB SPL at 1 mW, Impedance (at 1 KHz): 56 Ohm, Ergonomic earphones for high comfort, Replaceable cable