RAK makes sure to use the highest quality components feasible. We sell Genuine OEM products as well as aftermarket replacements. Obviously the OEM items will be the exact same as if it was bought at the dealership parts counter. The replacement "Generic" items are sourced from factories whose products are far superior to the cheap items you'll find on amazon, ebay, and competitor sites. We use three types of Remote Keyless Signal testers to ensure the products are functioning properly before we send it to you. Specific items are tested on special testers configured for special modes like passive smart key analysis. When products are ordered for vehicles that have onboard programming procedures, the instructions are shipped in the package. Experienced tech support staff are ready and willing to assist customers with programming. Products that require batteries include them.