ELECFREAKS Octopus 5mm LED Brick - White - EF04065
Octopus 5mmLED light Brick, and special sensors Arduino board, and an ambient light sensor extension combination can be used in interaction with the light works. When the LED light module is connected to Arduino, the digital pin (LOW on, HIGH off) is used to control it. The brightness of the LED can be controlled via PWM output.
Octopus Electronic Bricks: you can use them to build electronics projects just as easily as piling bricks. By using Octopus electronic bricks, you may easily connect Arduino-compatible boards with various digital, analog, and I2C/UART interfaces. These breadboard-less firm connections are prepared to extensive modules like potentiometers, sensors, relays, servos even buttons, just plug and play.

Programming Code
You can see the whole program from the link here.
LED brick flashes with a 1-second interval.
Content
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1 x 5mm LED Brick
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1 x Analog Sensor Cable