The Okdo TelePort blue LED module which has a light emitting diode. Its RJ11 port integrates G, V and S(Signal). When S is at high level, the LED will light up when at low level, LED will go off. In addition, the output high/low levels or PWM signals from IO port of the control board also can determine the state and brightness of the LED. Compatible with RJ11 6P6C OKdo TelePort Control boards and expansion shields
5mm LED emits blue light
Comes with a fixing hole to make it easy to attach to projects