Noise Canceling Feature Reduces Background Nose In Any Environment Ideal for Airplane, Train And Bus Use - Frequency Response: 20~20K Hz, Impedance: 32 Ohms, Sensitivity: 110db ± 2db/Mw.Closed-Style, Dynamic Headphone with 40mm Driver - Cable Length: 1.5m.Foldable Headband Allows Phones to Fold Down To A Small Size For Convenient Storage - Plug: 3.5mm Stereo Dual Mono Adaptor.Active Noise Canceling Headphones Reduce Outside Ambient Noise By 83.4% - Power Source: 2 X AAA Batteries.Noise Cancellation Can Be Switched On/Of Achieve peace and quiet with these noise-canceling headphones from Pyle. They reduce background noise in any environment. They're ideal for use while traveling - on planes, trains, and buses alike. The closed-style headphone forms a seal around your ear as a first wave against noise - then, if you choose, turn on the active noise canceling technology to further reduce outside ambient noises by 83%. And when you're not using them, conveniently fold them up thanks to the foldable headband. Uses a 3.5mm plug. Requires 2 x AAA batteries.