Extra tools are required for installation. Replace and update your seat occupancy sensor. Once an accident occurs, this simulator activate the just like old sensor (whether or not anyone on the car seat). After installing the simulator, on dash SRS faulty warning code can be cleared (first time required a diagnostic computer). Name:Car Seat Occupancy Mat Sensor SRS Bypass Emulator Fitment Type:Direct Replacement Install Fitment:This sensor is compatible with the following European models:(Includes all variants: convertible, coupe, estate, hatchback, M-Power, saloon) Fitment:For models 1997-2016; For 1997-2003: E31, E36, E38, E39, E46, E53, etc; For 2003-2007: E60, E63, E65,E66, E87, E90, etc; For 2007-2010: E60, E63, E64, E65, E70, E71, E81, E87, E90, E92, E93, etc; For 2010-2016: X6, X5 Instructions: Step1: Open the simulator top cover, adjust the switch. Step2: Locate the seat occupancy sensor unit under front passenger seat, cut the wire and reconnect it to the simulator. Step3: Fasten the seat belt on front passenger seat, then use a diagnostic computer (NOT INCLUDED) to turn off the SRS warning code for the first time. Note: 1.Please confirm it fits your car before ordering. 2.Professional installation is highly recommended. 3.After installing the simulator, whether or not anyone on the car seat, this simulator send seat occupancy signal to OBC! Installation guide not included, we strongly recommend you professional installation. Color: As Shown Material: plastic Package Contents: 1 x Car Seat Occupancy Bypass Emulator MAT Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.