The WiZ 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 schedule 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. WiZ lights connect to your existing Wi-Fi, no additional hardware is needed.
A: No but you do not want to use 5ghz wifi with products like this anyway. All 5ghz routers should have both frequencies and moving slow bandwidth devices to the 2.4 makes your computers on the 5ghz network run faster.
A: Unfortunately they are not compatible with HomeKit but they can be controlled thru Siri.