Sony factory refreshed headphones with new silicon ear pieces!These things are new and sound amazing! Enjoy your favorite workout tunes without distraction. The WI-SP600N wireless in-ear headphones are IPX4 rated splash-resistant to protect against sweat and rain, and feature Noise Canceling technology to minimize distractions. Switch to Ambient Sound Mode to balance your music with the background, so you can hear a gym partner or oncoming traffic. Frequency Response: 20 Hz–20,000 Hz (44.1 kHz Sampling); NFC: Yes. Bluetooth version - Version 4.1. Effective Range Line of sight approx. 30 ft and Frequency Range 2.4 GHz band. Features & details Digital Noise Canceling puts the focus on your music Ambient Sound Mode for safer, more intuitive listening IPX4-rated for sweat resistance EXTRA BASS sound with deep, punchy low end Up to 6 hours of battery life on a single charge.Magnet:Neodymium Built-in microphone for hands free calls and use with your voice assistant Wireless freedom with Bluetooth technology and NFC In the box: USB Cable (Micro-USB cable (approx 50cm)), Long Hybrid silicone rubber earbuds (SS, S, M, L ×2), Arc Supporters (M, L ×2) It’s important to ensure a snug fit in the ear canal is achieved—by installing the appropriate size earbuds