Features1. True wireless stereo, HIFI sound quality; Bluetooth version 4.1, 2.4GHz frequency, ultra-low power consumption.2. Both left and right ears have full Bluetooth headset function. You can use it alone or in pairs when listening to songs and making phone calls.3. Customized explosion-proof steel shell can be used for rechargeable lithium battery, large capacity of 85 mAh, and both ears can make continuous phone calls for 5-6 hours.4. Industry-leading Bluetooth technology, 30 meters indoor circle without text messages, 10 meters outdoor circle continuously line. (Without obstacles)5. Built-in CVC6.0 intelligent noise cancellation function, clear call; support 1 drag 2 can connect 2 mobile phones at the same time.Comes with a single ear charging compartmentSignal enhancement, battery upgrade, appearance upgrade, with battery base chargingProduced in our own factory, patented appearance products, full quality inspection and shipment, everyone can sell with confidenceAbsolute price advantage, welcome OEM / ODM quantity and price,Bluetooth version CSR solution V4.1.1 + EDRStandby time: 15-20 daysHeadphone battery capacity: 50 mAhHeadphone charging time: 1hBody weight: 3.5 gramsWireless Features1. True wireless stereo, HIFI sound quality; Bluetooth version 4.1, 2.4GHz frequency, ultra-low power consumption.2. Both left and right ears have full Bluetooth headset function. You can use it alone or in pairs when listening to songs and making phone calls.3. Customized explosion-proof steel shell can be used for rechargeable lithium battery, large capacity of 85 mAh, and both ears can make continuous phone calls for 5-6 hours.4. Industry-leading Bluetooth technology, 30 meters indoor circle without text messages, 10 meters outdoor circle continuously line. (Without obstacles)5. Built-in CVC6.0 intelligent noise cancellation function, clear call; support 1 drag 2 can connect 2 mobile phones at the same time.Comes with a single ear charging compartmentSignal enhancement, battery upgrade, appearance upgrade, with battery base chargingBluetooth version CSR solution V4.1.1 + EDRStandby time: 15-20 daysHeadphone battery capacity: 50 mAhHeadphone charging time: 1hBody weight: 3.5 gramsWireless frequency: 2.402-2.480GHzCharging voltage: 5V