audio-technica SOLID BASS Portable Headphone Black Red ATH-WS550 BRD Newly designed 53DEEP MOTION DRIVER delivers overwhelming bass sound. Headphones fold flat for compact portability. Type: Sealed dynamic type/Driver: 53mm/Output sound pressure level: 106dB/mW Play frequency band: 8~24,000Hz/Maximum input:750mW/Impedance: 38 Weight (excluding code): about 254g/Plug: 3.5mm gold-plated stereo mini (L-type)/Code: 1.2m