Extension boards come with several safety features, including surge protection and overload protection. They ensure that your devices are protected from voltage spikes and other electrical hazards. 

Crompton extension boards are generally not suitable for high-power devices. They are designed primarily for low to moderate power needs and may not provide the necessary capacity or safety features required for high-power kitchen appliances. When connecting appliances like mixer grinders or air fryers, make sure you check the compatibility first. 

Yes, Crompton extension boards are designed to be compatible with various international plug types, including US, Euro, Italian, and Chinese plugs. This makes them ideal for use with devices from different countries. 

Some models of Crompton extension boards come with built-in USB ports, allowing you to charge your devices without the need for separate adapters. These are particularly useful for charging smartphones, tablets, and other USB-powered devices. 

The right extension cord length depends on the distance between the power outlet and your devices. If the distance is short, a 1.5-meter cord may suffice. For longer distances, consider an extension cord length of 3 to 5 meters to ensure flexibility in device placement.