Lenovo X3 has Bluetooth V5.0 dynamic Hi-Fi smart noise reduction low latency ear hook IPX5 waterproof with microphone. It also has HSP / HFP / A2DP / AVRCP Bluetooth protocol, up to 10 meters operation range, 140mAh battery capacity. You can listen to it for about 5-6 hours, depending on the volume, and it takes about 1.5 hours to charge, 19g weight, 13.4 x 12.0 x 5.9cm package size.