Overview:BT 5.1 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 1200mAh 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:【High Speed Transmission】：Built-in powerful Bluetooth 5.1 chip, ensures high data transfer speed, stable and fast connection, and low power consumption.【Simple&Fast Pairing】：Just take the earplugs out of the charging box, and they will automatically pair with each other. 【Touch upgrade】：Fingerprint touch without pressing, no more pressure on your ears. Easy to control music and calls, and activate voice assistant.【360 Degrees Great Sound】：Built-in Mic on both earbuds delivers clearer talking sound in stereo mode, experience real three-dimensional sound in a virtual World,supporting hands-free call.【LED battery display】： Can clearly show the battery allowance of the earbuds and charging box.【Good battery life】：Music Play Time about 4 hours.Specifications:Brand: LenovoModel Number: XT82BT Version: 5.1Transmitting Distance: up to 12m (no obstacle)Drive: φ13mmFrequency Range: 20-20KHzMicrophone Sensitivity: -42dB±3dBImpedance: 16ΩCharging Case Battery Capacity: 3.7V 1200mAhEarbuds Battery Capacity (Each): 3.7V 30mAhMusic Play Time: about 4 hours (depends on music volume)Earplug Charging Time: about 1 hourHeadphone Box Charging Time: about 1 hoursColor: Black, White (Optional)Earbud Size: Approx. 2.8*2.5*1.7cm/1.10*0.98*0.67inEarbud Weight (Each): 4.4g/0.15ozPackage Size: 14.0*9.0*4.0cm/5.51*3.54*1.57inPackage Weight: 89g/3.14ozPackage List:1 * Pair of Earbuds1 * Charging Case2 * Pairs of Earcaps1 * Charging Cable1 * User Manual (English/Chinese)