Microphone Specification: Brand: Lenovo Model: Xt90 Material: Abs Bluetooth Version: 5.0 Frequency Response Range: 20hZ-20khz Communication Distance: 10m Standby Time: 300 Hours Earbud Battery Capacity: 35mah/3.7v Charging Case Battery Capacity: 300mah/3.7v Earbud Rated Output: Dc 5v=20ma Earbud Rated Current Consumption: 10 Ma Charging Port Of Charging Case: Usb TypE-C Color: Black, White (optional) Product Size: 54*35*13mm/2.13*1.38*0.51" Product Weight: 44g Packing Size: 70*45*25mm/2.76*1.77*0.98" Gross Weight: 90g