CV-14 a.c. standard lock release
The Golmar CV-14 a.c. standard lock release 
 
Features:
 
Adjustable bolt
Medium size shield
Failsecure
Casing manufactured in 2mm thick pressure injected light alloy
Adjustable bolt on all models, allowing 3mm precision
Standard: only enables the door to be opened while the telephone lock release push button is pressed
Operation voltage from 8v to 12v a.c. (750mA consumption)
 
View here Golmar lock releases brochure. 
 
Dimensions:
Medium shield is 159mm overall height. Long shield is 249mm overall height