To switch the electrical door lock to open status, then to press down the power switch on thehandle to light up the research light. The red button on the left side handle can be interchangedbetween 35W and 65W power rate.35W switch performs the best within 500m in lighting while65w does the best within 1000m in lighting. The effectively workable lighting distance is1000-2000m while it can effectively lights up to over 3kms.