Item Type: Electronic Building Block Sensor Material: PCB Purpose: Designed for beginners and contains 21 commonly used sensors to meet the needs of various experiments for beginners. Also contains a for R3 motherboard Main Control Chip: For ATMEGA328 microcontroller External Power Supply: 7-12v, 9v recommended Clock Frequency: 16MH USB Cable Power Supply: 5v EEPROM: 2K Built-in Flash Memory: 32K For SRAM: 2K Male to Female 24# Wire: Approx. 20cm / 7.9in Data Cable: Approx. 50cm / 19.7in 1、The appearance uses a different red from the official blue, giving everyone a different experience 2、Come with simple wiring, plug and play, no soldering needed, easy entry 3、In terms of hardware, using for ATme-ga16U2 instead of 8U2. This update is served for the USB interface chip. In theory, can make machine simulate USB ID, such as for MIDI/Joy-stick/Keyboard 4、Contains 21 kinds of commonly used sensors, which can satisfy beginners for various simple experiments 5、Contains a for R3 motherboard, and for ATMEGA328 microcontroller, very practical 1 x Straw Hat LED White-Red Module (pad hole) Red 1 x Straw Hat LED White-Green Module (pad hole) Red 1 x Straw Hat LED White-Blue Module (pad hole) Red 1 x Passive Buzzer Module (pad hole) Red 1 x Two-Color LED Module (pad hole) Red 1 x 5V Single Relay Module (pad hole) Red 1 x Photosensitive Resistance Sensor (pad hole) Red 1 x Tilt Module Sensor (pad hole) Red 1 x Microphone Sound Sensor (pad hole) Red 1 x MQ-2 Smoke Sensor (pad hole) Red 1 x Thermistor Sensor (pad hole) Red 1 x LM35 Temperature Sensor (pad hole) Red 1 x Water Level Sensor (pad hole) Red 1 x Soil Sensor (pad hole) Red 1 x DHT11 Temperature and Humidity Sensor (pad hole) Red 1 x Ultrasonic Sensor 1 x Flame Sensor (pad hole) Red 1 x 1302 Clock Sensor (pad hole) Red 1 x Rocker Module Sensor (pad hole) Red 1 x Water Drop Vapor Sensor (pad hole) Red 1 x Human Body Infrared Pyroelectric Sensor (pad hole) Red 1 x Male to Female 20cm/40P/2.54/12 Strand Copper Wire 24# Wire 1 x Data Cable 50cm 1 x For R3 Motherboard 1 x Plastic Storage Box