The Sensor Explorer is an add-on to the Piper Computer Kit or the Piper Make Starter Kit. For Piper Make, the Sensor Explorer has four new missions, an incredible way to measure the world around you! Missions include Security Zone, Ultrasonic Drum, Ther-Mood-Stat and Color Coded. Sensor Explorer is an add-on and REQUIRES a Piper Make Starter Expedition Kit with the Raspberry Pi Pico to get started (sold separately)