The Echo Box is a complete kit. Fun for learning to code.

Echo Box 3D printed Shell parts for our kit.
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Here is a description from our site so you know the parts you'd need if you'd like to make one

The Echo Box is a complete kit. Fun for learning to program and play with an Arduino UNO R3. It comes fully assembled and works as a measurement tool. You can write a variety of sketches using the Ultrasonic sensor as well as program the LCD and all the buttons.
It includes:

1. Arduino UNO R3
2. HC-SR04 Ultrasonic sensor, with extension wires.
3. LCD Shield Kit w/ 16x2 Character Display for Arduino Uno R3, with extension wires and pin mounts. We get ours from Adafruit.
4. (2) 9 Volt batteries wired in parallel, with the Arduino Power plug adapter. This is the Power Pack for the Echo Box.
5. A pre loaded basic Distance sensing sketch and the downloadable source code.

http://www.badbrick.com/content/badbrick-echo-box-complete-kit