RCA HP242 Sport Neckband Headphones (Discontinued by Manufacturer) Adjustable in-ear speakers swivels for proper fit, single -sided cable; cable length 1.2m / 3.9 ft Lightweight, active fit design for mobility, unique design- vertional in-ear fit 3.5mm gold-plated jack for clear sound reproduction, frequency response: 20-20,000Hz Driver size 13mm; sensitivity 107dB Maximim input power 30mW; Impedance 16 Ohms