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There are multiple features supported by a cordless phone. If you are someone who spend a lot of time on phone it would be best for you to have the in-built speaker phone. This will save you to carry your handset all time and also allow more than one person to take part in the interaction. With todays digital transmission there is a less threat on security but if you are security aware customer Spread Spectrum Technology is the one for you. Another technique is Frequency Hopping.
In terms of power Li-ion batteries provide the best performance This method used by this battery ensures that you get full performance until you no longer have a charge With other types of battery, you will find that the quality of the call diminishes as the battery drains. Ni-MH batteries are the next option. Memory effect is caused when you recharge a phone before its battery has been completely drained.
The memory size is also important as it will be important to have large phonebooks and Caller ID logs for your home phone, so you can easily access any number without digging out a diary or PDA. Also check whether the phone has the feature of digital answering machine.
There are cordless systems that offer multiple extensions. Most of them takes up a single phone line and let you use handsets throughout your home for easier access. These handsets can often be used for purposes served by intercom. If you picked up a call that's for somebody else, no need to shout and call that person an let the caller wait for uncertain time, you can just transfer the call to the handset nearest him/her.
Just do not fall for sleek looks but count the functionalities of the phone. Especially transmission must not be lousy.