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Lenovo XT91 True Wireless Earbuds Bluetooth-compatible 5.0 Stereo In-Ear Headphones TWS Earphones with Microphone Specification: Brand: Lenovo Model: XT91 Bluetooth-compatible function: support Bluetooth-compatible version: 5.0 Transmission range: 10m Battery capacity: 40mAh Music playback time: 4 hours (for each earbud) Case battery: 300mAh Microphone: yes Microphone sensitivity: 115±3dB Sensitivity: 108 decibels Resistance: 16Ω Frequency response range: 20-20000 Hz Driver diameter: 8 mm Maximum output: 10mW Charging port: USB C Color: black, white Product size: 62*40*25mm Product weight: 35g Packing size: 140*90*30mm Gross weight: 78g Note: There may be slight size deviations due to manual measurement, different measuring methods and tools. The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor. Included: 1 Pair X Earbuds 2 Pairs X Ear Tips 1 X Charging Case 1 X Charging Cable 1 X Manual