Easy to install, just directly put in. Caution: Since our rubber silicone cases are very snug to your car keys, it might be a little difficult to install. You can give it a tiny bit of lubrication, such as hand cream.Compatible with Mercedes Benz A, C, E, S, CLA, CLS, GLA, GLB, GLC, GLE, GLS, G Glass 4 Buttons key fob cover. Please carefully check your car key fob the same one as the fob key in 2nd image before you place the order. This item is cover for your key fob, not the KEY FOB, pls note.Made with silica gel, it is extremely light, easy to clean and durable for using & protection. Prevent damage to your original factory key fob with this protective shell, such as nicks from accidental drops and scratches from items in your handbag or pocket!Never Lose Your Vehicle Keys Again: Simply connect your fob key with Bonus 2pcs Key Rings & 1pcs Silicone Band Key Chain and never worry about losing or dropping them! This purchase is a small investment to protect you against great expense replacements from dealers or locksmiths.Designed according to the original car key, it fits perfectly with your key. The key buttons have precise position and shape. Youll always be able to access the features with one click! Black outlook refine the product appearance to be fashionable and stylish.