I have a USA doorbell with instruction that said it needs a 16Volt 10VA transformer, now i'm in Hongkong using 220V system, what kind of transformer will I need in order to operate this doorbell? the transfomer here only show what amp, not VA.
fyi
HongKong Voltage: 220-240 Volts (U.S./Canada are 110-120 Volts)