Abstract: A method for touchless gesture recognition is provided. The method includes transmitting ultrasonic signals via a speaker. The method includes generating ultrasonic signals. The method includes receiving the reflected ultrasonic signals from an object via two or more microphones. The method includes computing a frequency shift according to the reflected ultrasonic signals. The method includes identifying a gesture that corresponds to a movement of the object according to the frequency shift. The method includes performing a function that corresponds to the gesture.

Abstract: A method for touchless gesture recognition is provided. The method includes transmitting ultrasonic signals via a speaker. The method includes generating ultrasonic signals. The method includes receiving the reflected ultrasonic signals from an object via two or more microphones. The method includes computing a frequency shift according to the reflected ultrasonic signals. The method includes identifying a gesture that corresponds to a movement of the object according to the frequency shift. The method includes performing a function that corresponds to the gesture.

Abstract: A decorative light consists of a sleeve defining a lower rectangular opening and an upper socket, a base received in the sleeve and defining two bottom holes and an upper socket, a bulb having a lower portion received in the socket of the base and two leads extending through the bottom holes of the base to be in contact with two contacts fixedly attached on an inside of the sleeve defining the lower rectangular opening, and a waterproof ring having an upper portion hermetically engaging with the bulb and a lower portion hermetically engaging with the sleeve.