1 Gang. The Alpro PB86 infrared proximity switch offers contactless features meaning sterile and hygienic operation. The simple swipe of the hand operates the switch, ensuring no contact is required. The unit is designed to be used in conjunction with the full range of Alpro access control products.. Adjustable relay trigger from 1 to 9 seconds. Proximity switch. Hygienic & sterile operation - ideal for infection prevention in hospitals. For indoor use only