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 super low power consumption. The ENC (Electronic Noise Cancelling) Quad Pro microphone delivers superior audio quality for voice calls over the internet, and the latest Bluetooth chipset extends call and play time up to 7 hours. The STIX II Pro includes a pocket-sized rechargeable carry case that charges the earphones up to 3.5 times, has a super-fast 50 minutes charge time, built-in smart touch to control your music and calls, and an IPX5 water-resistant chassis to enhance your audio experience.