Not Just for Music: Enjoy legendary Technics engineering for crystal clear sound in your phone and video calls and rich, expansive audio in everything from audiobooks to movies Product Note : If the size of the earbud tips does not match the size of your ear canals or the headset is not worn properly in your ears, you may not obtain the correct sound qualities or call performance. Change the earbud tips to ones that fit more snugly in your ears Switch Seamlessly From Your Computer to Mobile Devices: Go from video calls, to phone calls, to listening to music or working out; Multi-Point Connectivity lets you pair to more than 2 Bluetooth devices easily and reliably Ergonomic, Comfortable Design for A Custom Fit: Pairing timeless design with modern technology, AZ40 offers a comfortable in-ear headphone shape with 4 earpiece sizes to choose from for your best fit Hear and be Heard, Even in Noisy Surroundings: Enjoy clear calls that amplify words and reduce outside sounds; JustMyVoice technology features 6 individual mics, with a snug, noise-reducing fit and advanced wind noise reduction Easy Setup with Long Battery Life: Quick setup with the Technics Audio Connect app, with 7.5 hours battery life (25 hours total including cradle charge) Charging case: Approx. 2.5 hours. Earbuds with Charging case: Approx. 3 hours