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If the earbuds are not in the charging case or haven’t been put back into the charging case, the turn-on of the two earbuds is independent. You need to turn on both earbuds.If the earbuds can not pair with your bluetooth device or can not pair with each other, please try to reset them according to Instructions mentioned above.CXK offers a pair of high-fidelity Bluetooth Wireless Earphones with up to 30 hours of battery life.You wont be worry about master-slave restrictions and enjoy single earbud mode.Suitable size, easy to carry, can use in anytime anywhere, achieve what you desired.