These wireless sport earbuds feature advanced Bluetooth 4.1 technology with multi-point connectivity, allowing you to connect two mobile devices simultaneously. The high-sensitive built-in microphone with CVC 6.0 noise cancellation technology delivers crystal clear stereo sound during calls and music playback. The sweat-proof neckband design includes comfortable ear hooks and three sizes of ear tips to ensure a secure, stable fit during any activity. The rechargeable 80mAh battery provides up to 4.5 hours of continuous music playback or talk time with only 2 hours of charging time via the included USB cable. The in-line remote button enables hands-free calling and easy control of music playback. With a transmission range of up to 32 feet and frequency response of 20Hz to 20kHz, these earbuds deliver immersive audio quality. Ideal for running, jogging, hiking, yoga, gym workouts, and travel, these earbuds come with a convenient carrying case for storage and portability. The lightweight design weighs only 17 grams, making them comfortable for extended wear during any fitness activity or daily commute.