Made of aluminum alloy, this new instrument box heater is especially designed for the de-humidifying of instrument boxes and other equipment. It is made of exclusive aluminum alloy heat diffusing sheet and fine quality cast aluminum electric heating tubes. It features compact size, elegant outlook, even heat diffusion, fast heat conducting and large diffusing area, thereby offering a much longer working life of electric heating tubes and long time reliable performance. Working voltage: AC220V. Nominal power that can be made to order: 50～500W ±5%