rmobileandcraft signature Portable Headphone Amplifier

Signature A Sign of Quality Please were correctly when you use the earphone,put earplug with "L" in left ear, earplug with "R" in right ear. When listening to music with the earphone,we suggest you adjust the sound volume to a proper level to perfect your eardrum. To ensure your safe driving, please do not listen to music with the earphone when you drive stay the earphone away from magnetic field. No prior notice will be given if the specification and outline design of the earphone were adjusted due to technology improvement, please understand. Speaker size:10mm Frequency range: 18-20,000Hz Sensitivity:32 Cable Length:120cm