Audio-Technica Balanced Armature type Inner Ear Monitor Headphones Red ATH-CKB70 RD Model: Balanced Armature type. Output sound pressure level: 111dB / mW. Playback frequency band: 10~15,000Hz. Maximum input: 3mW. Impedance: 51. Weight (excluding code): about 5.8g. Plug: 3.5mm gold-plated stereo mini (L type) Code 1.2m (Y type). Accessories: earpiece (XS, S, M, L) High resolution Balanced Armature drivers deriver high quality sound. Acoustic horn to increase the propagation efficiency of sound.