Overview: BT 5.3 technology brings high-speed data transfer speed, stable performance, and low power consumption. With true wireless stereo technology, you can use the headset solely or used them in pairs. Equipped with a 250mAh charging box to store and charge the earbuds. Built-in Microphone delivers a clearer and more realistic sound. It will bring you a perfect user experience. Features: The latest BT 5.3 technology enables stable connection, fast transmission speed and low power consumption. Auto power on and fast pairing between left and right earbuds once taking out of the charging case, quick to pair with BT-enabled audio devices. True wireless stereo dual-ear design, left and right earphone channels are separated. It can be used solely or in pairs. Long touch the right earbud for 2s to switch between game mode and music mode. Low latency delay, play games freely. Ergonomic and 3.5g lightweight design ensures wearing comfort and stability, suitable for hiking, running, cycling, climbing, driving, etc. Touch control design, no more pressure on your ears. Easy to control music and calls, and activate voice assistant (only for iOS). A 250mAh charging case can charge and store the earbuds. 30mAh battery in each earbud offers about 4 hours of music time. Built-in Mic on both earbuds with built-in call noise reduction algorithm delivers clear talking sound in stereo mode. Specifications: Brand Name: Lenovo Model Number: XT81 BT Version: 5.3 Transmitting Distance: up to 10m (no obstacle) Drive Diameter: 13mm Frequency Range: 20-20KHz Mic Sensitivity: -40dB3dB Impedance: 32 Charging Case Battery Capacity: 3.7V 250mAh Earbuds Battery Capacity (Each): 3.7V 30mAh Music Play Time: about 4 hours (depends on music volume) Earbuds Charging Time: about 1 hour Charging Box Charging Time: about 1.5 hours Color: Gray, Blue (Optional) Earbud Size (Each): 3.0*1.9*1.7cm/1.18*0.74*0.67in Earbud Weight (Each): 3.5g/0.12oz Charging Box Size: 5.3*5.1*2.3cm/2.08*2.00*0.90in Charging Box Weight: 39g/1.37oz Package Size: 13.7*9.0*3.0cm/5.39*3.54*1.18in Package Weight: 83g/2.92oz Package List: 1 * Pair of Earbuds 1 * Charging Case 1 * Charging Cable 1 * User Manual (English/Chinese)