A covered switch should be used where a user would be able to see or be aware of an adversary before an adversary would see them. The switch's small size means it can be concealed under a counter or in the kneehole of a desk, and the recessed housing makes it harder to press accidentally. Pressing the button causes the zone to open momentarily. A hold up button consists of a recessed button in a plastic or metal housing, connected to an NC circuit. The most common panic button is a hold up button. Overt appearance and non-secret operation - an emergency button that can be quickly activated with the palm of an open hand is used when the user may have time before an adversary can notice a force them to stop. Employees of these businesses practice pressing the button without looking and with one hand in the air, until they can activate the alarm while giving the appearance that they are merely opening the cash drawer. In these instances, speed is judged more important than covert appearance. Overt appearance and secret operation - some high risk locations such as check cashing businesses in high crime neighborhoods mount a regular emergency button right next to, or underneath, the cash drawer.
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