【Advanced Bluetooth 5.3】Featuring the latest Bluetooth 5.3 technology for stable and efficient wireless connectivity 【Powerful Sound】Equipped with a 45mm diameter speaker, the speaker can deliver clear and robust audio output up to 4.5W 【Long-lasting Battery】2000mAh battery capacity provides up to 15 hours of playtime at medium volume, perfect for extended use 【Multifunctional Design】Includes Bluetooth connectivity, calling function, and built-in lighting for enhanced user experience 【Speacial Design】The air duct design makes the sound more pleasant and rounded Specifications: Model: 625C Bluetooth Chip: Jieli AC6965E Bluetooth Version: 5.3 Battery: 18650 / 3.7V / 2000mAh Playtime: Up to 5.5 hours at max volume, 15 hours at medium volume Charging Time: Approximately 3 hours (±0.5) Speaker Size: 45mm diameter, 25mm height, 4Ω 3W Maximum Power Output: 4.5W Material: ABS + Metal Mesh Dimensions: 350.4 x 79.54 x 52.76 mm Weight: 538g