Compact headphone microphone of excellent sound quality, ease of use, and sensitivity. Sensitivity -40 Ўѕ 3dB Impedance Max. 2.2 §Ъ Standard power supply 2.0 V DC Current consumption Max. 0.5 mA Sensitivity reduction Within-3dB at 1.5V S/N More than 58dB Directivity Omnidirectional High Sensitivity Headphone Mic 3 Mini Clips for Tidy Arrangement Attractive & Compact Design