Features 1.Surprisingly lightweight. Foldable and portable, light and comfortable, making you fondle admiringly. 2.40mm high quality drive unit, bringing outstanding performance of the sound quality. 3.The sponge-filled PU leather headset is comfortable to wear, with moderate tension and elasticity, and you can wear it for a long time. 4.Suitable for all kinds of people. Thick low frequency, clear and bright alto and treble. 5.Attractive and stylish appearance, bringing great using experience, also suitable for kids. specificationItem Type: Headphone Headphone Material: Environmentally-friendly plastic Drive Unit: 40mm Line Length: Approx. 1.5m/4.9ft Frequency Response: 20Hz-20KHz Battery: 90mAH Interface Type: Micro USB Sensitivity: 103d85dB at 1XHz Support Type: Universal for mobile phone/computer Nominal Impedance: 3215% Battery Model: Button battery cr2032 (90mah) Color: Black and red, Black and blue (optional) PackageList1 x Headphone1 x User Manual1 x Button Battery