Q: Initial defective, even after hours of charging, it will not turn on or operate the lamp. A: This product may not be charged with the included cable. Make sure the USB cable is properly connected Q: The device cannot be connected to the main unit: It can be used with wired, but it is not recognized as a Bluetooth connection. Another controller can connect to bluetooth without problem; even if you reset the controller that is not a problem on the switch, you will find a fault in the controller. A:Switch unit and controller are not possible to connect the bluetooth connection. If the controller does not respond at all, try reregistering the controller to the main unit. 1. "Controllers" from the HOME menu; 2. "How to Hold/Order" 3. Long press the controller synchronous button 4. Once the register is displayed. If you cannot register the unit itself, the charging is not completely discontinued, the communication may be discontinued. Please try to fully charge the controller Q: There may be cases where the left of the controller cross key is not affected by a bad contact.A: If the stick does not operate properly, the correction may be improved. Stick correction step 1. Select "Settings" in the HOME menu. 2. Select "Controller and Sensor" → "Stick Correction". 3. After the controller is connected to the switch, continue to knock down the stick in any direction. (If the main unit system version is less than 13.0.0", please push the stick you want to correct. 4. Check the reaction of the stick. Follow the instructions on the screen to see the reaction of the stick. 5. Follow the instructions on the screen to proceed with the correction. If the stick does not operate properly even after correction, you can try to reset. How to reset: Insert the elongated object into the reset hole at the back of the controller(push it into deep position), press the reset button to reset the controller