Technical Parameter: 1. Speaker dimension ф16mm; 2. Impedance: 32Ω; 3. Spec. of plug: ф3.5mm stereo; 4. Frequency range: 20Hz-20KHz; 5. Sensitivity: 116dB+3dB S.P.L at 1KHz; 6. Rated input power: 3mW; 7. Maximum input power: 15mW; Description: 1. The model can be used for MP3, MP4, Walkman etc; 2. Adopt international advanced technology, unique design, durable and clear voice; 3. The design is suitable for ear listening, portable and easy to carry;