High grade stainless steel water cup $ 40.54 Product information: Material: 304 stainless steel Cup style: straight cup Capacity: 501ml (including) - 600ml (including) Heat preservation: 63C, upper (6h) Cold insulation: below 10C (6h) Battery capacity: 3.7v500m ah Waterproof performance: IP67 Charging mode: USB Charging time: 2.5h Bacteriostatic time: 7min / 6H Sterilization rate: 99.9% Packing list:Cup*1