Spec:Item Type: Insulin Refrigerator BoxMaterial: ABS, electronic componentsTemperature Adjustment Range: 0-18℃Voltage: 5V 3.4APower: 10WRefrigerator Host Size: Approx. 210 x 95 x 103mm / 8.3 x 3.7 x 4.1inRefrigerator Size: Approx. 175 x 60 x 25mm / 6.9 x 2.4 x 1inStorage Capacity: Able to store 3-5 insulin pens or around 10 insulin vials. Power Supply: USB cable, adapters, power banks, and car USB ports. Suitable for Use: Traveling, home, office, car, pharmacy, hospital.Suitable for Refrigerating: Ideal for refrigerating drugs and biologics requiring refrigeration, including insulin and interferon.Product Principle: This product uses a thermoelectric cooling component or semiconductor to achieve refrigeration. By applying a DC electric current to an area of the semiconductor, low temperatures are generated, and then these low temperatures are conducted to the medicine box. Finally, heat is dissipated outward by the heat sink through a fan.How to Use:To turn on or off the device, press the power button briefly. After turning on the device, pressing the two temperature adjustment buttons on the right side can adjust the temperature. The temperature can be adjusted between 0‑18℃, with a temperature adjustment precision of 1℃. Pressing the AUTO button briefly sets the temperature to 8℃.packing list:1 x Insulin Refrigerator Host1 x Portable Case1 x USB Cable