The fan will cost an additional 8 yuan if it is replaced with an external adapter, and an additional 23 yuan if an external adapter is provided. If an internal adapter is provided, it will cost an additional 20 yuan per unit. For remote control fans, it will cost an additional 25 yuan per unit. For solar panels, it will cost an additional 7 yuan per watt, and for solar panel power cables, it will cost an additional 2 yuan per meter. For colored packaging, it will cost an additional 2 yuan per unit, and for the outer packaging, it will cost an additional 2 yuan per unit. Note! This quote is for the current day's price, and all prices are subject to the unit price discussed on the day of the order confirmation.