The STIX II Pro true wireless earphones with active noise cancelling feature optimized audio drivers, an ENC Quad Pro microphone, and Bluetooth 5.3 for low power consumption. The ENC Quad Pro microphone provides superior audio quality for internet voice calls, while the latest Bluetooth chipset extends call and play time to up to 5 hours. The STIX II Pro includes a pocket-sized rechargeable carry case that charges the earphones up to 3.5 times, with a super-fast 50-minute charge time. It also has built-in smart touch controls for music and calls, and an IPX4 water-resistant chassis to enhance your audio experience.