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 300mAh 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. Specifications: Brand Name: Lenovo Model Number: XT62 BT Version: 5.3 Transmitting Distance: up to 10m (no obstacle) Drive Diameter: 8mm Frequency Range: 20-20KHz Mic Sensitivity: -35dB±3dB Impedance: 16Ω SNR: ≥90dB Distortion: ≤5% Audio Decode: AAC, SBC Charging Case Battery Capacity: 3.7V 300mAh Earbuds Battery Capacity (Each): 3.7V 40mAh Music Play Time: about 4.5 hours (depends on music volume) Earbuds Charging Time: about 1.5 hours Charging Box Charging Time: about 1.5 hours Color: Black, White, Pink, Purple (Optional) Earbud Size (Each): 2.6*2.3*1.6cm/1.02*0.90*0.63in Earbud Weight (Each): 3.5g/0.12oz Charging Box Size: 4.8*4.8*2.7cm/1.89*1.89*1.06in Charging Box Weight: 28g/0.98oz Package Size: 10.5*8.2*3.8cm/4.13*3.22*1.49in Package Weight: 69g/2.43oz Package List: 1 * Pair of Earbuds 1 * Charging Case 2 * Pairs of Earcaps 1 * Charging Cable 1 * User Manual (English/Chinese)