Technical Parameter: 1. Spec. of driver: ф15mm 32Ω; 2. Spec. of plug: ф3.5 stereo; 3. Frequency range: 20Hz-20KHz; 4. Rated sensitivity: 120dB+3dB; 5. Distortion< 0.2%; 6. Rated input power: 10mW; 7. Maximum input power: 20mW; Description: 1. The model can be used for MP3, MP4, Walkman etc. 2. Combined with international advanced acoustic technology, unique design, durable and clear voice; 3. The design is suitable for personal listening, portable and easy to carry;