Rechargeable units give the advantage of portability, but without the need to buy batteries. For general use the chimes should last a month without recharging, and then it is purely a matter of replacing the units in their cradle.
The chimes will continue to operate whilst in the cradle. Both the SX-201ib and SX-220iw will work with additional portable chimes SX-11i and plug-in units SX-41i or any of the Byron SXi range to extend your system. All models can detect 2 bell push buttons, and bell push models SX-30, SX-33, SX-38 and SX-39 will allow a selection of different tunes depending on which bell push button is pressed
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