Smart cup with rapid cooling and heating functions. - Type: Smart cup - Color: Black - Functions: Rapid cooling and heating - Temperature range: 0°C to 60°C - Usage environment: Car/Home - Features: Improves the taste of beverages I bought it for around 10,000 yen. I've used it a few times at home. It seems to really show its value when keeping drinks cold or warm while traveling in the car. Hot plastic bottles didn't fit. Cold bottled juices (like Ambasa or C.C. Lemon) and canned beer fit.