Panasonic RP-HT227 HT227 Monitor Headphones with In-Cord Volume Control In-cord volume control; XBS(R) Extra Bass System; Single-side monitoring system; Neodymium magnet; 28mm driver; Imp: 24_; Sensitivity: 102dB/mW; Freq resp: 18Hz - 22kHz; Max input: 1,000mW; 6.6ft cord; Includes 1/4" plug adapter