The sleek design of the AH-C160W uses unique Earhook technology, developed with a leading hearing aid specialist, to keep the earpieces in place – even during heavy workouts or when running. Three sizes of ring give the best fit for the ears, ensuring pure music playback and excluding noise. High-quality 11.5 mm drivers with digital signal processing Bluetooth Class 1 connectivity for tangle-free use and reliable connection Clear Voice Capture noise reduction for phone calls, plus voice prompts Earhook technology and a choice of eartips for comfort and a secure fit Tough construction for life on the move and Built in Music Controls and Microphone Sweat and moisture protection for long-term durability, IPX5/7 Sweat resistant. Up to 4hrs of playback time at max volume.