ELECOM HiRes corresponding stereo headphones (with microphone) canal type 9.8mm driver CH1000 Silver EHP-CH1000SSV Driver unit: dynamic type 9.8mm Sound pressure sensitivity: 100dB / 1mW / maximum allowable input: 100mW Playback frequency band: 5Hz ~ 40kHz Plug: 3.5mm 4-pole mini-plug (L-type) Accessories:  Japanese manual, ear caps (S / M / L), code keeper, porch