Abstract: A radar system includes an ultrasonic radar unit and a warning device. The ultrasonic radar unit is configured to be detachably mounted on a vehicle, and is configured to output a pairing signal when a pairing function is activated and output a warning signal upon detecting an object that is within a range. The warning device is configured to be electrically connected to the ultrasonic radar unit and to be mounted inside the vehicle. The warning device is configured to wirelessly communicate with the ultrasonic radar unit to receive the warning signal and the pairing signal; when receiving the pairing signal, couple the ultrasonic radar unit to one of a plurality of warning areas that is on the warning device according to the pairing signal; control one of the warning areas that is coupled to the ultrasonic radar unit to output a visual warning upon receiving the warning signal.

Abstract: A pillow is constructed to include a hollow body of sponge, the pillow body having an open chamber longitudinally extended through two opposite vertical lateral sides thereof, and a support of foamed plastics inserted into the open chamber of the pillow body and detachably secured thereto by tie cords for supporting the pressure of the head resting on the pillow body. The front side of the pillow body is curved outwards, when put under the user's head, forming a smoothly arched protruding supporting portion that supports the user's neck.