For the last 1.5 months, I've been using these headphones designed for children. I've finally ordered some skullcandy crushers to replace them. These actually sounded pretty decent for kids headphones though. :
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Amazon.co.jp: Skull Candy Official Store, Subwoofer Headphones, Crusher Evo (Original Sticker Included) (Limited-Edition ALL LOVE Limited Color) : Electronics
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Skullcandy's Grom Wireless Headphone for Kids | Skullcandy.com
Amazon.com: Skullcandy Dime 2 In-Ear Wireless Earbuds, 12 Hr Battery, Microphone, Works with iPhone Android and Bluetooth Devices - Black : Electronics