A wire free optical smoke detector for use with the Yale Easy Fit range of alarms. Once the concentration of the smoke exceeds the set threshold value, the Smoke Detector transmits a signal to the control panel. After the transmission is completed, the smoke detector then activates its local built-in buzzer with the LED flashing. It will check the smoke concentration every 10 seconds, and should it be over the threshold it will continue the local siren warning.