The bt diverse 7400 additional handset and charger is the extra handset for the new top of the range models this means that users can simply buy as many additional handsets they need when purchasing the phone also unlike some models this also means adding extra bt diverse 7400 handsets at a later date is also possible with the ability to register up to 5 handsets in total users can buy and pair an extra 4 bt diverse 7400 cordless phones to their system the bt diverse phones the 7400