Speakerphone, perfect for Internet, video conferencing, games, lingual recognition.A must-have tool for VoIP Skype, , , ICQ.Comfortable experience for ear about the soft ear cushions in harmony with s more→omatology.Extremely portable , also work with all audio devices such as for / MP3 / MP4 / CD players with 3.5mm .Product descriptionsmaterial: plasticPower Rating: 15 mW (0.69VMax. Output: 20 mW (0.8 V)DC Resistance Impedance: 32 4.8 (15% ); 32 4.8 (15%) at 1 kHz, 0.18VSPL:. 120 + 3frequency response: 1, Table 1 input: 0.18V