Autowave Mercedes-Benz 3 Button Keyless Remote Key. Remote keys are the typical modern vehicle key and come with buttons to operate the central locking features. Sometimes will operate other features such as the headlights. Transponder: On-board Mercedes Transponder. Buttons: 3 Buttons (Lock, Unlock & Boot). Frequency: 433MHz. Dimensions: 2.00cm x 7.00cm x 13.50cm. Weight: 0.03kg. Blade: HU64. This item is non-returnable once cut. This is a remote for keyless Mercedes-Benz vehicles. This key is applicable for all IR keys pre-FBS4.