BL7 BX7 B20 high power semiconductors mobile phone cooling cooler with large heat dissipation surface pad phone cover

Instructions for freezing conditions: To achieve a freezing effect with the phone cooler, please ensure the following conditions are met: Transformer voltage requirements: Use a transformer with an output voltage higher than 5V3A to supply power. Choosing the charging cable: Make sure to use the default charging cable we provide for connection. Room temperature condition: Ensure that the room temperature during operation is below 25°C. Important warning: Please note that this device is a phone cooler, not a professional ice maker. Avoid operating the device when it has been discharged for a long period in an attempt to achieve the freezing effect, as this may cause damage to the device or pose a safety risk. If the product flashes, it means the power source is insufficient. You need to use a 5V3A plug to supply power and connect it with our charging cable. This is not a quality issue.