Product details Overview: 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 the earbuds. Built-in Microphone delivers a clearer and more realistic sound. It will bring you a perfect user experience. Features: 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 -enabled audio devices. True wireless stereo dual-ear design, left and right earphone channels are separated. It can be used solely or in pairs. 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 and store the earbuds. 35mAh battery in each earbud offers about 4 hours of music time. Built-in Mic on both earbuds delivers clearer talking sound in stereo mode, hands-free, convenient to use. Specifications: Brand Name: Lenovo Model Number: XT88 Version: 5.3 Transmitting Distance: up to 10m (no obstacle) Drive Diameter: 10mm Frequency : 20-20KHz Mic Sensitivity: -40dB±3dB Impedance: 32Ω Charging Case Battery Capacity: 3.7V 250mAh Earbuds Battery Capacity (Each): 3.7V 35mAh Music Play Time: about 4 hours (depends on music ) Charging Time: about 1.5 hours Color: Black, White (Optional) Earbud Weight (Each): 3.5g0.12oz Package Size: 10.4*8.1*3.0cm4.09*3.18*1.18in Package Weight: 63g2.22oz Package List: 1 * Pair of Earbuds 1 * Charging Case 1 * Pairs of Earcaps 1 * Charging Cable 1 * User Manual (EnglishChinese)