The 4 secondary outlets only work when there is a device connected to the master outlet and this device is switched ON.
Note: your main device (like TV or PC) must be connected to the master outlet.
The connected device to the master outlet must consume > 30 W continuously (any laptop or energy saving light bulb will not function).
The Philips Surge Protector detects when a connected device to the master outlet is switched both at ON and OFF.
The purpose of this master + secondary outlets is that if you switch on/off the master component, all other devices connected to the 4 secondary outlets are automatically switched on/shut down as well.
Low power devices connected the master outlet, consuming less than 30 W (continuously) might not be detected. As such the secondary outlets will not function.