In-Earphone 100% Guarantee Original and Brand QKZ DM9 New Headset Earphones for Smartphone. Quality optimization of exclusive patent, metal composite vibrating membrane. The ergonomic design, nipple grade silicone ear muffs. Ear and tail pipe connection with oblique angle design, comfortable and easy to wear. It has high quality sound, enjoy your life. A perfect gift for yourself or friend.

• Impedance: 16Ω±15%
• Speaker: 12mm
• Input power: 3mW
• Material: Metal CNC Zinc alloy
• Maximum Input Power: 5mW
• Sensitivity: 100±3dB (at 1KHz 1mW)
• Speaker Power: Rated input power: 3mW
• Speaker Frequency Response: 20-20K Hz
• Operation Temperature: -10 Celsius to +40 Celsius