Phiaton PS 200 Sound Isolating In-Ear Earphones with Dual Micro Transducers (Woofer andTweeter) (Discontinued by Manufacturer) Dual Balanced Armature drivers with passive crossover that provide stronger bass sounds and a wider frequency range than traditional earphones Constructed with aluminum which delivers an ultra lightweight design for maximized user comfort Superior Sound Isolating technology Included soft silicon ear-tips in the three sizes for the perfect fit Includes Carrying Case and Plug Adapter for Air Travel