The TE-02n are a high performance inner ear headphone. They are ideally suited for daily use with portable music players or phones， offer excellent sound quality with 4 buds sizes for different ear size. In addition， these headphones offer unique waterproof protection equivalent to IPX5/IPX7 standards， making them suitable for use at gym， running， at the beach or pool side. Type: Dynamic Driver: 9mm driver unit with powerful neodymium magnet Impedance: 16 ohm Sensitivity: 110dB/mW Maximum Input: 50 mW Reproduction Frequency: 20Hz - 15kHz Cable: 1.2m Plug: 3.5mm stereo mini plug