HiSoundAudio(TM) The Original Unbeatable Sound Quality (PAA-1 PRO) Model No.: PAA-1 PRO The most bassy earbuds!!! Specification: Type: Dynamic, open; Size of the driver: 16mm; Impendance: 32OHM; Sensitivity: 105db; Maximum SPL: 120db (1khz, 1Vrms); Frequency response: 17-22 khz; Type of the Jack: 3.5mm; Cable length: 119cm. The PAA-1 PRO is unique with its crossed sound signatures. It has a huge sound stage which is like a full-size headphone. PAA-1 PRO cause no fatigue after extensive listening Comes with hard-shell carry case