Features:  
Premium Materials:  
   - Inner Wall: 316L food-grade stainless steel (high corrosion resistance).  
   - Outer Case: 304 stainless steel + anti-slip silicone base.  
   - BPA-Free: PP plastic, food-grade silica gel, and co-polyester for safety.  

Smart OLED Display:  
   - Touchscreen OLED shows real-time liquid temperature to prevent burns.  

Temperature Retention:  
   - 12-hour insulation (hot/cold) with double-walled vacuum design.  

Leakproof & Portable:  
   - 360° rotatable lid with silicone seal (IPX7 waterproof).  
   - Curved mouth for easy filling/cleaning.  

Convenient Use:  
   - Lightweight (304g) with 420ml capacity—ideal for travel, office, or outdoor activities.  
   - Easy to clean (detachable PP leak-proof ring).  

Specifications:  
- Capacity: 420mL  
- Weight: 304g  
- Battery: 250mAh (20-day battery life per charge).  
- Dimensions: 220.5 x 66.5 x 66.5mm  
- Charging: Includes USB C cable.  

Ideal For:  Gifts, hiking, commuting, students, or daily hydration tracking.