The Panasonic KXTG6412S cordless with two handsets has an impressive array of features and functions that will bring a new dimension of convenience and flexibility to your phone. Equipped with DECT 6.0 technology you will enjoy clearer, more natural sounding voices and it won't interfere with other electronics in your home, such as microwave ovens, baby monitors or Wi-Fi networks. Call Block is for unwanted calls like telemarketers, etc. The KXTG6412S will store all the information of the unwanted callers in your block list eliminating future annoying calls by giving them a busy signal when they call your phone. It has a large 1.8" white backlit LCD display on its handset to ensure a natural-looking, paper-like appearance for optimum clarity and legibility. Outfitted with a Night Mode it allows you to program separate ringers for base and handsets, so you can set your bedroom handset to not ring while you are sleeping, but the handset in the living room will. Up to 6 handsets can be added while using only one base unit and one phone jack. (Additional handsets sold separately)