RAK makes sure to use the highest quality components feasible. We sell Genuine OEM products as well as aftermarket replacements. Without a doubt, the OE ones are exactly the same as the ones stocked at your local dealership parts department. 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. Free expert tech support is included with purchases. Batteries are always included with products that use batteries.