*IN PWR LED (Red): If the PSU is connected to the IN PWR socket but there is a charge failure or the input voltage (Vin) is too low, the LED will turn red, alerting you to the issue. | *IN PWR LED (Red): If the PSU is connected to the IN PWR socket but there is a charge failure or the input voltage (Vin) is too low, the LED will turn red, alerting you to the issue. |