Panasonic KX-TGA681 - cordless extension handset with caller ID

When the area around the other party is noisy and it is difficult to hear, you can reduce the surrounding noise to make the speaker's voice easier to hear just by pressing the dedicated button.You can block annoying calls from unwanted numbers. Numbers on your call block list will be blocked (the unit emits no sound to the caller, and disconnects the call) if they call you. The phonebook can be automatically shared between handsets without having to copy it, so you can use it in the kitchen, the living room, etc. Any handset registered to the base unit can use the shared phonebook.