Product details of Sony WF-XB700 Truly Wireless Headphones with EXTRA BASS™ - EXTRA BASS for deep, punchy sound - Truly wireless design with BLUETOOTH wireless technology - 9hr long battery life, total 18hr with charging case - Ergonomic design for a secure, comfortable fit - Easy hands-free calling and voice assistant SPECIFICATIONS & FEATURES Enhance your everyday life with the WF-XB700 truly wireless headphones. Featuring EXTRA BASS™ for deep, punchy sound, they also offer long battery life, stable Bluetooth® connectivity, ergonomic design and IPX44 rating water-resistance. - EXTRA BASS for deep, punchy sound - Truly wireless design with BLUETOOTH wireless technology - 9hr long battery life, total 18hr with charging case - Ergonomic design for a secure, comfortable fit - Easy hands-free calling and voice assistant DRIVER UNIT 12mm DSEE HX No FREQUENCY RESPONSE(BLUETOOTH® COMMUNICATION) 20 Hz - 20,000 Hz (Sampling frequency 44.1 kHz) PASSIVE OPERATION No NFC No