7.5W Bluetooth Bulb RGBWW Free App Timer Music Dimmable Group Smartphone Controlled This bulb support Bluetooth version 4.0 or above.It can achieve remote control ,switch light,adjust brightness and color temperature.There are 16 million colors and dozens of light changing modes.In addition, it do not need additional line,conveniently installed and used. It is a high capability and easily replaceable LED bulb.Certainly,it have other advantages,such as light source is LED,power consumption is just 20% of traditional incandescent,working life is 10 times of traditional save-power light,safe and stable. he case adopts aluminum fins,which can let air backflow cyclically.This design resolved high-powered LED thermal problems in highest degree. It can be used widely in bedroom ,living room ,entertaining place and operating atmosphere etc. Many functions here: Timer , Music , Dimmable, Multicolor, Free App , Group Control etc.