GE LED plus linkable motion turns any fixture into a motion detector, so your lights or outdoor security work automatically and hands-free. From off to on, you get the light you need. For larger spaces, just link two or more LED plus bulbs or fixtures to create a motion sensor system. One easy addition, lots more control over your home.Link up to 30 bulbs or fixtures to brighten a larger space instantlyDusk to dawn setting turns light on at night and off during the dayTwo-stage lighting brightens light when motion is detectedSame size and shape as a halogen PAR38 floodlight bulb