Keyless Entry Remote Control Key Fob Replacement for 2004-2009 Lexus RX330 RX350 RX400H (3-Button HYQ12BBT) - 2 Pack - Perfect for Car Key Replacement & Spare Key Programming

This is a perfect replacement. The key starts the car, the doors lock and unlock (driver first, then all on the second press), the hatchback door opens as expected when the button is held down. It functions exactly as the original factory key.The electronic transmitter is the same size and shape as OEM so I was able to use this and another product out there on Amazon (item # B08LV1R6SB) which provides a new housing for my factory "blade" that had the plastic housing break off. I had already scavenged the electronics from the factory key to make another duplicate key but I wasn't using the factory "blade". With these two products, I have two fully working keys again. I didn't have to find a locksmith to cut this for me since I didn't end up using that part of it (at least not yet).Techstream successfully programed both the "immobilizer" and remote entry (two separate things) for my key. On my vehicle, Techstream was required. The "insert the key, take out the key, open the door twice...etc." process for either the immobilizer or the remote entry didn't work for me but that is likely car and model year dependent.The fact that I couldn't program it without Techstream is due to design by Lexus. It is not an issue with this key or the seller - the parts supplied worked exactly as a factory key would have worked except that you need to be able to program it yourself with Techstream or find someone to help or do it for you. And of course someone to cut it if you need to have it cut. Just know that you may need access to Techstream to make it work for your car or you will need to find a locksmith/mechanic that is able to do it for you if you don't have access to Techstream. And to program the immobilizer to your car, it needs to be part of a key that is cut and can be inserted into the ignition (it has to be quite close to the key hole for about 60 seconds).It was also my experience that you must also have at least one working master key with remote/immobilizer electronics (not a valet key) to program additional keys that are capable of starting the car. You can program the remote entry without an existing master key, but you cannot register a new key to the car's immobilizer without a master key. At least this is the case for me on a 2008 RX350.