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YOCUBY KKY-991 bluetooth wireless neckband sports headphones is compatible with iOS and Android.The retractable and foldable design makes it very easy to use and carry. Highlight Point: -Bluetooth V4.1, enhanced data rate transmission, CSR8635 chip and CVC6.0 noise cancellation technology ensure you crystal clear sound and stable connection. -Humanized neckband wearing design ,the soft silicon texture can decrease the burden on ears and provide a great comfort feeling when sports or movements. Specification: Bluetooth version: V4.1+ EDR Support: HSP, HFP, A2DP, AVRCP Transmitting power: Class 2(-6dbm – +4dbm) Working distance: â¤10m (33 feet) Frequency range: 2.4026-2.480GHz Battery: 400mAh rechargeable lithium battery Charging time: â¤ 3 hours Music time of headphone: about 15 hours Music time of speaker: about 5 hours Talk time of headphone: about 20 hours Talk time of speaker: about 11 hours Standby time: about 300 hours Package Inclued: 1 x Bluetooth headphone 1 x USB charging cable 1 x User manual 2 x Pair ear tips