Sensor diameter 19mm Dimensions of additional sensor attachment: 63 x 30 x 32mm Working distance 0-2.5m Signals only with a sound signal, no LED screen. This device is a high-tech bionic product that uses waves sent out during operation, and can measure the distance to obstacles through their reflections. The driver is warned in three ways: the distance to the obstacle is displayed on the digital board (accurately in centimetres), the lit diode shows the direction of the obstacle: L- left, M- middle, R- right and the alarm signal informs different distances with different sounds. Maximum measuring distance 30cm-2m. Maximum current consumption 200 mA. INSTALLATION: Installation of the device may only be done by a professional car electrician. All connections must be insulated or otherwise prevent moisture from entering the connections. The sensors must be installed at least 50 cm from the ground and the distance between the sensors no more than 70 cm. Before installation, make sure that there is enough space for the sensor in the given location. The diameter of the opening is 22.5 mm. Install the main processor in the trunk of the car. Connect the power wires as follows: black wire - car ground (minus), red wire - reverse light plus wire. Install the digital tablet on the dashboard of the car in the drivers field of vision. Install the sensors on the rear bumper of the car, connect the sensors starting from the control block with the sensor located on the left side of the bumper in sockets a, b, c and d and in the display socket marked DISPLAY.