Omaker Bluetooth 4.0 Wireless Stereo Sport Headphones Earbuds with Built-in Microphone Wireless Bluetooth Headphones-Advanced Bluetooth 4.0 technology for qucik connect and energy saving. Ergonomic Design-It has a slim, durable design that is comfortable to wear for your workout. Noise Cancellation-CVC Noise Cancellation 6.0 technology reduces outside noises, enable clearer sound from microphone. Designed for Motion-It is perfect for Running, Hiking, Marathons, Cycling, Skating, the Gym, Yoga, Pilates, Crossfit Training & More. Perfect Combo-It also comes with an Omaker Sport Armband Case which is slim lightweight and has dual arm-size slots.