For S500P S510P from December 2021. Double-sided tape included in the product is used for installation. Depending on the vehicle, it may be necessary for the customer to increase the double-sided tape by themselves. We do not provide installation support. Please make sure to ask a contractor who can install the product, as modification may be required. We do not mark merchandise values below value or mark items as "gifts" - Japan, US and International government regulations prohibit such behavior. Thank you for your understanding.