Enjoy quality Audio-Technica sound and the freedom of true wireless listening with the ATH-CKR7TW. With Japanese design, they're engineered to take the true wireless experience to the next level. They last for a total of up to 15 hours with the included charging case and are easily controlled by an app on your smart phone or tablet. Truly wireless listening With two independent ear-buds fitting comfortably and securely in your ears, not a single wire gets in your way. Feel the inspiring freedom of truly wire-free listening. They also support aptX tech for higher quality, stable wireless transmission. Full-frequency audio 11mm drivers deliver quality audio up and down the full frequency range (5 - 45,000 Hz), so your music is packed with powerful bass and delicate detail in the higher register. App control Using the Audio-Technica Connect app (available on iOS and Android) on your smart device, you can control your music playback, and take phone calls. Long battery life They last for up to six hours of music off a single charge, and the included charging case holds enough power to keep them going for an additional nine hours. These True Wireless headphones are compatible with all smart devices with Bluetooth, including from Apple, Samsung and Google, and other Android smart phone brands.