If the LED light strip you purchased can be cut, the remaining part that you have cut off cannot be used anymore. If you want to reconnect them after cutting, you must use an additional 4 pin connector to reconnect. However, if the operation is improper when you cut and connect, it may also cause the light strip to stop working properly. So we recommend that you double-check the length of the strip before cutting and avoid the need to reconnect after cutting.