Choose an option A: Smart Black [for residential commercial housing] 1 ring 1 button B: Piano white [for residential commercial housing] 1 bell 1 button C: Smart Black [Ringing upstairs and downstairs at the same time] 2 bells 1 button D: Piano White [Ringing upstairs and downstairs at the same time] 2 bells 1 button E: Smart Black [You can ring the bell at both the front and rear doors] 1 bell 2 buttons F: Piano White [You can ring the bell at both the front and rear doors] 1 bell 2 buttons Black enhanced version [no battery replacement for 10 years] 1 ring 1 button White enhanced version [no battery replacement for 10 years] 1 ring 1 button Pro Black [Recommended! Add 20 for a better experience] 1 ring 1 button Pro white [no battery replacement for 10 years, light] 1 ring 1 button Black enhanced version [simultaneous ringing upstairs and downstairs] 2 bells 1 bell White enhanced version [simultaneous ringing upstairs and downstairs] 2 bells 1 bell Pro black [simultaneous ringing upstairs and downstairs] 2 bells 1 button Pro White [Ringing simultaneously upstairs and downstairs] 2 bells 1 button
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