Features:Adopt Bluetooth 5.0 chip, which has characteristics of more stable transmission and low power consumption.Equipped with a large capacity 4800mAh charging case, convenient for you to charge earphones or mobile phones.Built-in microphone for high-definition calls, accurately identify and effectively suppress external noise.Powerful noise reduction quieter call experience, with passive noise reduction function, internal noise reduction.Compact and lightweight, easy to carry. Specification:Bluetooth verison：5.0Headphone capacity: 50mAH / 3.7 VBluetooth protocol: A2DP / HFP / HSP / AVRCRFrequency range: 2.402-2.480GHzEnvironmental noise: ≤90dBTransmission distance: 10mCharging case capacity: 4800mAhHeadphone charging time: about 2 hoursTalking time: 4-5 hoursMusic playing time: 5 hours (medium volume)Charging case input: 5V 600mACharging case USB output: 5V 1ASize:-Earphone: 22.5x17mm-Charging Box: 110*45*32mmPackage Includes:2*Earphone，1*Charging Box，1*USB Cable，3 Pairs of Earphone Cap(S+M+L)，1*User Manual