This is a kind of high quality and durable key case. If you have a key with broken buttons or worn key case， this unit is the best replacement for you. Features: Best replacement for a key with broken buttons or worn key case. Key case only. No electronic internals. This is an aftermarket replacement case. Take the internal electronics(include immobilizer/transponder chip) from original remote and place them to our key shell! Good quality， durable to use. Specifications: Color: Black Fitment: for Mercedes Benz Button: 3 Buttons Product Size: 9.7 * 4.5 * 1.3cm / 3.8 * 1.8 * 0.5in Product Weight: Approx. 30g / 1.1oz Package List: 1 * Key Fob Case Note: This item isn't a remote key， it is just a remote key shell case replacement. There is NO interior (remote/electronics/transponder chip) unit inside. Please check your key look the same as the one in our product picture above before you purchase.