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K2 sensor kit (reference KS0179) built on the same base as the K1, with a different selection of modules: 19 projects accompanied by wiring diagrams, example codes and video tutorials. Published contents: Keyestudio REV4 control board (UNO R3 compatible), 830-point breadboard, 65 flexible wires, 10 20 cm male-female Dupont wires, 0.5 m USB cable, component box and resistor color code card. Components and modules: 10 330 Ω resistors, 10 1 kΩ and 10 10 kΩ resistors, 5 red LEDs, 5 yellow and 5 green, 2 10 kΩ potentiometers, an active buzzer and a passive buzzer, a push button with blue and yellow caps, a white LED module, an active buzzer module, a Hall effect magnetic sensor, a collision sensor, an LM35 temperature module, a photoresistor module, a vibration sensor, an MQ-2 analog gas sensor, a water sensor and a PIR motion sensor.