iFrogz EP-LR-NM-PRP Little Rockerz Headphones - Purple (Discontinued by Manufacturer) 85-decibel volume limit governor to protect little ears Light weight, on ear headphones Kid-friendly design Compatible with any device with a 3.5mm jack. Driver Unit: 30mm neodymium - Impedance: 150 ohms - Sensitivity: 86dB+/-3dB at 1KHz - Frequency Response: 20 Hz to 18 kHz - Cord Length: 1.2 meters