Astrum ET240 Bluetooth Wireless Sport Headphones - Bluetooth Earbud (Gym / Running / Hiking / Jogger / Exercise) Hands-free Calling Headset with Build-in Mic for any Bluetooth Enabled Devices - GREEN Designed primarily for sports and working out with CSR wireless Bluetooth 4.0 technology, easy and fast pairing with smartphones, tablets and other Bluetooth enabled music devices. Adopt the most advanced bluetooth noise reduction CVC6.0 technology, reduces outside noises, enable clearer sound from microphone call quality, get high quality, built-in Microphone, hands-free phone conversation even on the street or inside shopping mall. Comfortable and secure design fits perfectly to your ear; the cable smartly stays out of your way when running, jogging or exercising. Two powerful audio drivers on each side offering balanced audio and crystal clear sounds, providing a comfortable and dynamic listening experience. Bluetooth Headphones equipped with Bluetooth 4.0 technology and the microphone allowing you to listen to music and answer call from your cell phone as far away as 33 ft/10 m through a variety of activities. Universal compatibility: Works with iPhone, iPad, Android Smartphones, tablets, iPod touch, and other Bluetooth devices.