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