Tula Sports Headphone, (tm) Neckband Wireless Bluetooth Headset, and V4.1 Apt-x Noise Canceling Headphones Earphones with Microphone & Stereo with Magnetic Attraction (Black) BLUETOOTH V4.1 + CSR8645 CHIP with APT-X: with excellent sound effect collection, superior sound isolation, efficiently reduces external noises, and provides steady Bluetooth signal and support stereo APT-X lossless music. LONG-LASTING ENJOYMENT: up to 4 hours music, 5 hours talk time, 2 hours charge time. MAGNET ATTRACTION DESIGN and SWEATPROOF: hang like a necklace around your neck, and 33ft working distance, our sport headphones will let you enjoy music when running, gym, sports & exercise and other activities LATEST BLUETOOTH 4.1 TECHNOLOGY: Smallest microphone, PCBA design and battery case, lightest weight. WHAT YOU GET: 45 days money-back & 12-month worry-free warranty, and friendly customer service.