Also, note that it is better to buy equipment that is powered by rechargeable batteries. They may have a larger upfront cost, but will prove to be more economical in the long run. Look for a system that notifies you or gives an alarm that can alert you if which batteries are running low. Or if you can, frequently test the components
of your system and replace batteries regularly. Another disadvantage
of a wireless configuration is the risk of faulty installation. Even though you don’t need any formal training to set up this system, there’s always the risk that you did not do it properly.