Etekcity S1 in-Ear Stereo V4.1 Bluetooth Wireless Headphones with Built-in Mic (Black) HIGH TECH FEATURES: With bluetooth 4.1 APT-X audio decode technology, you'll enjoy a pure bass high-def sound you've never had before; CVC 6.0 noise cancellation technology works well in dampening the surrounding environmental noise, gives you a true feeling of independence when alone. Ideal for an airplane, train, or anywhere you want to hear your music, podcast, audiobook or phone call EXPANDED BATTERY: We have enhanced the battery of our bluetooth headphones to 110mAh, which ensures up to 10 hours of playback time and up to 230 hours on standby. You can wear them at work and at home doing odds and ends around the house all day long HUMANIZED DESIGN: In-line control panel with 3 buttons (volume, song seletion, telephone controls) is convenient to operate anytime you want. The high-sensitivity build-in mic is positioned closer to your mouth, ensuring you a much clearer phone call. The light weight design makes it comfortable to wear for extended periods TWO DEVICES AT ONCE: Easily connect to your iPhone/iPad/iPod/Samsung Galaxy and Amazon Fire TV to listen without wires. If you pause one device then audio automatically switches to other device MAXIMIZED COMFORT: Includes 3 different sized pairs of earbuds and soft rubber supports for a perfect fit. Swap the size of ear piece or ear hook to the shape of you ear to achieve optimal sound and comfort