1. The Laboratory Puts More Effort Into Finding A Balance Among Variables To Create A Listening System That Is More Suitable For Users. 2. 45mm Speaker, High-Fidelity Sound Quality, Composite Diaphragm, Stereo Wideband 3. Four Hours Of Music, Longer Battery Life, New Intelligent Battery System 4. Bring More Fun To Boring Work 5. Art And Music Are What You Deserve, Let Music Heal Your Mood Product Model: C10 Bluetooth Version: 5.1 Battery Capacity: 3.7V 800mAh Speaker: 45mm 4Ω 5W Effective Distance: ≥10m Playing Time: 2h-4h Charging Time: 2h-3h Frequency Range: 60Hz-20KHz Input/Output: DC 5V⎓1A Charging Interface: Type-C Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Not Affect The Use Colour:Gray Material:ABS+UV Package Contents: 1 x Bluetooth Speaker 1 x Charging Cable 1 x Manual In Chinese And English Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.