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Do not use a power bank to supply power to the cooler Power banks may incorrectly identify the device and restrict voltage and current, resulting in insufficient power supply to the cooler You must use a PD charger capable of providing 5V/3A to ensure proper operation Instructions for Freezing Conditions: To achieve a freezing effect with the phone cooler, please ensure the following conditions are met: Adapter Voltage Requirement: Use an adapter with an output voltage higher than 5V/3A for power supply Charging Cable Selection: Ensure to use the default charging cable provided by us for connection Room Temperature Condition: Make sure the room temperature during operation is below 25°C Important Warning: Please note that this device is a phone cooler, not a professional ice makerAvoid operating the device in an unloaded state for a long time in an attempt to achieve a freezing effect, as it may cause damage to the device or pose a safety hazard If the product is flickering, it.. t mens that the power supply is insufficient Iu ned to use a 9VzA plow to supply power and connect it with ur charging cable This is not a quality issue