The NS2000 Earphones will never let you down. Full of heavy beats and warmth at an affordable price. Sound Characteristics The dynamic speaker is designed for everyday listening. The earphones deliver a warm and rich sound throughout the entire sonic spectrum, backed by heavy bass. Materials & Design Every part, from the aluminum housing and noise isolating silicone sleeves to the Kevlar reinforced cables have been carefully designed to offer great durability. Features Speaker: 8.0 mm dynamic Sensitivity: 105 dB SPL @ 1 kHz Remote and Mic Impedance: 16 Ohm @ 1 kHz Extra Sleeves (S, M, L)Frequency: 20 Hz - 20 kHz Housing: Aluminum Cord length: 730/320 mm Cords: Kevlar, Copper, TPESleeves: Silicone1 year replacement warranty. Compatible with the following phone models: 3.5 mm headphone jack iPhone 3G (8/16GB)iPhone 3G S (16/32GB)iPhone 4 (16/32GB)iPhone 4 AT&T (16/32GB)iPhone 4 CDMA (16/32GB)iPhone 4 GSM (16/32GB)iPhone 4 Verizon (16/32GB)iPhone 4S (16/32/64GB)iPod touch 3G (32/64GB)iPod touch 4G (8/32/64GB)