The dual connection waterproof stereo Bluetooth earphone uses the latest Bluetooth 4.1 technology. It can connect to two Bluetooth devices at the same time which is convenient if you are carrying two smartphones, or one mobile and a tablet. This earphone has two noise cancelling build-in mic and vibration alert for answering the phone. It also support NFC for easier pairing. The earphone is powered by rechargeable Li-ion battery and can be recharge with the included charging cable.