When the LED blinks red, you should recharge the device. It normally takes about 2 hours to fully charge the battery. The LED will stay red when charging and will turn off when charging is complete.
You can connect Saturn via the supplied Micro USB cable to your own USB chargers(wall charger/travel charger/car charger, etc.) with 5V/500mA-1A or PC USB port. It’s ok to use most mobile phone chargers on the market.
For more details, please watch video user guide for Saturn-