Product description    Model: Balanced Armature type.Output sound pressure level: 111dB / mW.Playback frequency band: 10 ~ 15，000Hz.Maximum input :3mW. Impedance: 51Ω. Weight (excluding code): about 5.8g. Plug φ3.5mm gold-plated stereo mini (L type) Code 1.2m (Y type) ● Accessories: earpiece (XS， S， M， L)