The Philips Smart LED A21 full color bulb brings smart lighting for your daily living. Retrofit into any lamp shade to create the ambience of your choice with 16 million colors as well as warm to cool white light. You can set schedules to turn lights on and off according to daily or weekly routines, control with your smartphone or your voice and have remote access to your lights even when you're away. Philips Smart lights connect to your existing Wi-Fi, no additional hardware is needed.Length: 7.7 cm/ 3.03 in.Width: 7.7 cm/ 3.03 in.Height: 13.8 cm/ 5.45 in.