Brand: Shokz. MPN: S820-ST-SR-US. SUPERIOR SOUND QUALITY - Experience premium audio with our bone conduction technology, delivering crystal-clear sound and powerful bass without blocking your ears, ensuring awareness of your surroundings.   OPTIMIZED FOR CLARITY - Featuring a high-sensitivity microphone with -38dB +/-1dB, these headphones ensure clear and crisp voice transmission during calls, making them ideal for hands-free communication on the go.   RELIABLE BLUETOOTH CONNECTIVITY - Seamlessly connect to your devices with Bluetooth V5.3, offering a stable and efficient wireless range of up to 33 feet (10 meters), ensuring uninterrupted audio streaming.   Bluetooth 5.3 provides faster, stable wireless connection   ENHANCED COMFORT & FIT - Designed with a lightweight, full titanium frame and flexible nickel-titanium alloy band, these headphones provide a secure and comfortable fit for all-day wear during any activity.   EXTENDED BATTERY LIFE - Enjoy up to 12 hours of continuous music, podcasts, and calls on a single charge, perfect for long workouts, commutes, or travel; a quick 5-minute charge provides 2.5 hours of use.   IP55 rating protects against sweat and light rain   DURABLE & SWEAT-RESISTANT - With an IP55 sweat resistance rating, these headphones are built to withstand intense workouts and outdoor activities, protecting against sweat, moisture, and dust for lasting performance.   Perfect for running, cycling, hiking, and daily workouts