Stainless Steel With Spoon, Chopsticks, Knife And Fork Electric Heat Preservation Lunch Box $ 27.31 Product information: Capacity: less than 1 liter Body material: plastic Control method: mechanical Rated voltage: 24V (V) Rated power: 40 (W) Rated frequency: 50 (HZ) Power supply mode: AC Liner material: 304 stainless steel Heat preservation function: plug in