The SENSO Wireless Bluetooth Headset Activbuds S-250 has true high-definition sound, allowing you to enjoy solid bass and ultra-clear high-pitched stereo. Bluetooth V4.1 skip-free technology allows wireless connections up to 30 feet. IPX7 waterproof/sweat protection without fear of sports sweating and rain. Better battery efficiency up to 8 hours of use. Stylish and ergonomic design, beautiful and generous, passive noise reduction, safe and comfortable. Compatible with all Bluetooth-enabled devices, you can connect two smart devices at a time.