Buy the Amseco HUSK-20 Hold Up Button SPDT from us, an authorized dealer and get free shipping! The Amseco HUSK-20 is a mechanical hold-up switch designed for silent operation. It is activated by using one finger to press down on the switch. When activated, the switch mechanism locks, insuring an immediate alarm signal. A status window designed on top of the hold-up switch indicates its condition: RED (alarmed) and BLUE (armed). To reset the HUSK-20, use the key provided. The housing is made of metal and is painted gray.