This is the LED light bulb that is controlled by an iPhone. A free app automatically connects to the light bulb via Bluetooth 4.0, allowing you to turn the light on or off and choose from 100 levels of brightness with the touch of the screen. The app connects to up to 10 smart light bulbs at once and each one can be assigned a name or location and controlled individually or as a group. When you leave the house and are out of range the app will automatically turn off the lights and a timer built into the bulb enables you to set the light to turn on and off at specific times. The LED generates up to 400 lumens of bright white light—similar output to a 40-watt incandescent bulb yet uses 25% less energy and lasts 25 times longer. Compatible with iPhone 4S and later, iPad 3rd generation and later, iPad Mini, and iPod Touch 5th generation. Requires iOS 6.1 or Android 4.3 and later. 4 1/2" H x 2 1/3" Diam. (2 1/2 oz.)