Next-generation AI technology-equipped hot water bottle, rechargeable in 8-15 minutes. - Color: Beige - Charging Time: 8-15 minutes - Usage Time (Indoor): Approximately 4-8 hours - Usage Time (Outdoor): Approximately 8-10 hours - Technology: Next-generation AI control technology - Safety Features: Explosion-proof, overheat protection - Heating Efficiency: 100% Used only once. Thank you for your understanding.