Candeez&reg; Stereo Combo Pack, Stereo Headphones, Earbuds, and Speakers good for iPhone, iPad, iPod, Smartphones, Tablets, Laptops and more - Hersheys Speakers: Frequency: 150Hz - 20kHz Headphones: Frequency: 20Hz - 20kHz Earbuds: Frequency: 20Hz - 20kHz Connection: 3.5mm Stereo