REMAX RM-550 in-ear headphones. Provide high-quality, crystalline sound and a perfect fit to the ear. The kit allows you to make calls. Ergonomic shape reflects the geometry of the ear and guarantees a perfect fit, thanks to which REMAX RM-550 headphones do not cause discomfort even during prolonged listening to music. Noise reduction technology makes the product deliver clear sound in both high and low tones. Built-in remote with microphone allows you to make calls as well as reject and accept incoming calls. All without having to reach for the phone. Gold-plated 3.5 mm jack plug has a high resistance to abrasion and oxidation. Specification: Frequency response: 20 Hz-20 kHz Impedance: 16? ± 15% Sensitivity (SPL): 95 ± 5db Microphone sensitivity: -43 ± 4dB Rated power: 2 mW Plug: 3.5 mm Cable length: 1.2m