RAK makes sure to use the highest quality components feasible. We carry both OEM and replacement products. 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. Some products are checked on specific kinds of testers like smart keys. When there is onboard programming, orders are shipped with programming instructions. Free expert tech support is included with purchases. Batteries are always included with products that use batteries.