Sprout Harmonic 3.0 features Active Noise Cancellation and exclusive Duolink technology so you can remove distractions and share your sound experience. Active Noise Cancellation Harmonic 3.0 combines premium sound quality with Active Noise Cancellation to block out distractions and bring you closer to the music. ANC ‘listens’ to outside noise and plays opposite soundwaves to counteract it. Duo - Link Technology Exclusive Duolink technology lets you share sound between two Harmonic 3.0 Headphones, making them perfect for travel partners or entertaining kids. Designed for Comfort The Harmonic 3.0 features an adjustable headband and premium memory foam ear cushioning, designed for comfortable listening for hours on end. Long-Lasting Battery Listening to music on your commute and blocking out distractions all day at work? That’s no problem for the Harmonic 3.0, with up to 35 hours of playback time. Specification: 4x ANC Microphone, 1x Call Microphone Bluetooth V5.1 Operation range - 10m Qualcomm QCC3021 chipset Rechargeable battery Up to 35 hours playing time 800 m - Ah battery Type C USB charging input 3.5mm AUX-in Noise reduction coefficient: 35d - B +/-3 d - B Protein leather (Pleather) ear pads with memory foam Operating Temperature: 0-40°C