So wherever you go, you'll always have the space you need to focus. Reduce Noise By Up to 98%: Space A40 has an upgraded noise cancelling system to block out a wider range of distracting noises. Specifications: Brand Name: Lenovo Model: XT90 BT version: 5.0 Transmission distance: 10m / 33ft Drive diameter: 13mm Frequency range: 20-20KHz Sensitivity: 90☓dB Impedance: 32Ω charging Box battery capacity: 3.7V 300mAh Headphone battery capacity (each): 3.7V 35mAh working Time: about 3 hours
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