1. Replacement, replace the car key with the key case worn to the new key case. 2. There are 2 buttons. 3. Only the key housing, no internal electronics. 4. Weight: 22g. 5. Size: 48x 36x 13mm. Note: 1. This is not a remote control, it is just a replacement for a remote key case. 2. There are no electronic units inside. 3. Before purchasing, please check if your key matches this product