Wireless Bluetooth Stereo Headphones Noise Cancelling with Microphone Sports Running Gym Exercise Sweatproof Earbuds Headset for Outdoor Sports Color Green Upgrade BH35 with the world famous CSR Bluetooth 4.0 APTX . Not only more power saving, but also provide real bass stereo sound and crystal voice Bluetooth 4.1 Chip: The latest Bluetooth chip, can transmit data at high speed and bring you smooth music experience. Its low power ensures long lasting battery life: up to 7 hours continuous music time. It also works well with most mobile phones like iPhone/HTC/Motorola/LG/Samsung Fashionable: Finally we picked out three colors: green, red and blue, because we think they can best stand for your energy, passion and peace in mind Has a built-in microphone inside, you can use it for calls. When a call comes, you don't need to pull off the earphones, just press the button and tal Connect Two Devices at The Same Time and dont miss your calls when you have two cell phones