From JisuLife
• Stylish & compact • Silicone breathable neck brace • Adjustable / more suitable for usage • LED display screen • 100 gears wind control • Input: 5.0V=2.0A MAX(TYP) • Battery Capacity: 5000mAh (18.5Wh/3.7V) • Battery Cell: lithium-ion battery • Working Power: 8.0W MAX • Charging Time: 2.5-3.5 hours • Usage Time: 3-15.5 hours (depending on the service at different levels/usage scenarios)