CX15 Large-Screen Display Semiconductor Phone Cooler Radiator High-Power Magnetic Cooling with RGB Light Show AI Temp Control 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 outputvoltagehigher 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 25C. Important Warning: Please note that this device is a phone cooler, not a professional ice maker. Avoid 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 means that the power supply is insufficient. You need to use a 9V3A plug to supply power and connect it with our charging cable. This is not a quality issue. _x000D_ _x000D_