Product features: 

A) a differential voltage output: line voltage, pressure difference between the two lines. 

B) high/low voltage automatic switching between manual switching, remote device. 

C) short-circuit, break, tamper alarm, fault self-testing. 

D) free to set alarm delay time. 

E) waterproof shell and cover design-oriented industries. 

F) RS485 remote control, keyboard, computer, network, and other centralized management solution. 

G) DC12V, normally open/normally closed alarm output.