Powerful noise cancellation circuit (active noise reduction)Charging time is about 1 hour (power indicator charging: red light is on, full charge: red light is off (blue light is on)Bluetooth range: 10 meters with no obstacles.Product size: 53 × 44 × 21mmPlay time is about 120-150 minutesStandby time is about 48 hoursBattery capacity 35MAH (charging compartment 300MAH)Upgrade Feature 1:Pop Up Window (Only for IOS System above 12.1)Upgrade Feature 2:Hifi Stereo (Perfect Bass and Clear Sound)Upgrade Feature 3:Smart Touch Control (More Sensitive and Precise)Upgrade Feature 4:Real Power Display on Device (Know your Earbuds Easily)Upgrade Feature 5:Bluetooth V5.0 (Lower Power Consumption)