A powerful deep bass is realized with a bass booster that directly conveys the feeling of groove. Hands-free calling and remote control of music are possible with a smartphone A powerful deep bass is realized with a bass booster that directly conveys the feeling of groove. Hands-free calling and remote control of music are possible with a smartphone -Built-in multifunction button and microphone in the remote control for smartphones. You can make hands-free calls on your smartphone. In addition, you can play / pause music, which is convenient when listening to music on your smartphone (). The operation may differ depending on the smartphone model. -Xperia dedicated () "Smart Key app" that allows you to change the remote control operation to your favorite settings By downloading the "Smart Key app" from the Google Play store, you can customize the remote control operation using the multifunction buttons. From the Music / Call / Hold custom screen, you can set which operation (play / pause, answer / end call, etc.) is performed depending on the number of times the button is pressed. Only for Xperia devices with Android OS 4.0 or higher. The app may not be downloaded from non-target devices or in some countries / regions. * Depending on the music playback app you are using, the operation may differ from the settings. In that case, please try changing the headset settings of the music playback app. * In Android OS 5.0 or later, the app customization settings for calls are disabled. Call / end call works with a single press of the remote control button. Depending on the version upgrade of Android OS in the future, it may be necessary to update this application, which may change the function. ・ "Bass booster" that conveys the deep bass groove feeling While improving the airtightness from the driver unit to the eardrum, the operation of the low-frequency diaphragm is optimized by the duct provided on the housing. By capturing the overwhelming amount of bass with an accurate rhythm, the groove feeling of deep bass is directly transmitted. -Small and highly sensitive proprietary 12mm driver unit Adopting an original 12mm driver, the dome area is the same size as the 16mm driver unit. High sensitivity is achieved by enlarging the dome and maximizing the effective area of the diaphragm while achieving maximum mobility with the minimum edge width. ・ High magnetic force neodymium magnet Uses a 300kJ / m3 high magnetic force neodymium magnet, which is the same size as the 16mm driver unit, and a long voice coil, which is longer than the conventional voice coil and stabilizes the ground contact with the magnet. It is a powerful and highly linear drive system that realizes high-sensitivity and low-distortion acoustic characteristics in spite of its small size. -Angled earpiece method The angled earpiece method is realized by downsizing the driver. Since it can be worn all the way to the back of the ear, sound insulation is improved, and both a comfortable fit and high sound quality are achieved. ・ Hybrid earpiece that improves fit and sound quality Uses a hybrid earpiece that combines two types of hardness silicon. By using a hard material for the core part, the shape of the sound passage is maintained and the deterioration of sound quality due to the crushing of the tip is prevented. The outer part uses a soft material to improve the fit to the ear. It enhances the degree of sealing and realizes comfortable wearing even for a long time. ・ Serration cord that is hard to get entangled The fine grooves on the surface of the cord reduce the friction that causes entanglement. When used in combination with a code slider, it effectively prevents entanglement, making it comfortable to carry around when listening. ・ Stylish design and color variations Five colorful color variations. The colorful design that coordinates the