Xiaomi Redmi Aird ots Basic wireless BT headphones adopts BT 5.0 technology, bringing high-speed data transfer speed, stable performance and low consumption. With TW S technology, left and right ear channel separation. You can use the headset solely, or used them in pairs. Auto pairing between left and right ear buds once taking out of the case. Equipped with a 300mAh box to charge the ear buds for about 4 times, provides total 12 hours of working time. Built-in Microphone with noise reduction function delivers clearer talking sound. Its mini size and 4.1g weight of each earphone fit well to your ear canal, and guarantee stability and comfort when doing sports.