This rice cooker easily cooks 0.5 to 1 cup of rice simply by adding rice and water and pressing the switch. No outer box. I haven't used it much since I bought it, but please understand that it is a used item. - Size: 245mm x 90mm - Function: Can warm food - Capacity: 0.5-1 cup - How to use: Just add rice and water and press the switch Thank you for looking.