You can choose between using cold or hot water for the extraction process.If you decide to use cold water, kindly adhere to the instructions provided below:First, take off the lid, fill the water tank with cold water, and put the lid back on.Next, tap the power button once to see the battery level (green light on), then press and hold the power button to make cold coffee (green light lit).The red LED indicator activates when the battery level drops below 25%.To heat cold water, press the button two times to raise the temperature to 86°C within 5 minutes (orange LED flashing), followed by 4 beeps, after which it will automatically brew hot coffee for 60 seconds (green LED on).To utilize hot water, adhere to these instructions: 1.Take off the lid, fill the water reservoir with hot water, and put the lid back on.2.Press the power button once to check the battery level (green LED illuminates), then press and hold the power button to brew hot coffee for a minute (green LED flashes).Instructions for charging: 1.Make sure to start charging the device as soon as the red LED lights up.This red LED shows that the device is currently charging, and the green LED will turn on when it is fully charged.2.If you are using a USB cable to charge, the device will remain inactive until the charging is finished.Cautions: 1. Do not touch the red area on the cover while it is heating. Keep children away from the appliance during operation. 2. Never use the appliance without water, even if the anti-dry heat feature is set to 145 ° C. If this feature is triggered, the LED will flash for 5 seconds and a sound will be heard for 5 seconds. 3. After using the appliance, make sure to clean it and let it dry.