Datasheet

The LED is possibly the simplest actuator available. It’s a low power light
source available in many colors. It lights up when powered from an Arduino
pin.
Input: Arduino provides a maximum of 40 mA per pin; this is enough to
light up the LED through the digitalWrite() and analogWrite() functions.
Module description: this module features a 10mm Green Light Emitting
Diode, the standard TinkerKit 3pin connector and a green LED that signals
that the module is correctly powered and a tiny yellow LED that shows the
current brightness of the large green LED. A resistor provides the optimal
amount of current when connected to an Arduino.
This module is an ACTUATOR therefore the connector is an INPUT that need
to be connected to one of the OUTPUT connectors on the TinkerKit Shield.
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20 cm long wires for the TinkerKit with a 3 pin jumper on both sides
50 cm long wires for the TinkerKit with a 3 pin jumper on both sides.
100 cm long wires for the TinkerKit with a 3 pin jumper on both sides