» Evo 200m Wireless Flashing Door Chime
Chime requires 3 x AA batteries not supplied (typical life 1 year).
Bell push transmitter uses CR2032 battery supplied (typical life 3 years).
Dimensions:
Chime - 125h x 92w x 64d mm
Bell push - 82h x 28w x 16d mm
Weight: 247g with batteries
Note: building structures, e.g. metal and thick walls may effect transmission range between push & chime.
The man who invented shorthand, John Gregg, was deaf.
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UK Council on Deafness