powermore audiophile-grade headphones wireless bluetooth music stereo sports headset vibration neckband style for bluetooth devices (black)

bluetooth standard: v4.0 bluetooth operation: class 2(10m) frequency range: 2.401 ghz~2.480 ghz talk time: up to 15 hours playing time: up to 10 hours standby time: up tp 500 hours distance: places to play in the open distance of 10 meters(30 feet)...