Model 9001EXP explosion-proof Class 1, Division 2, Groups B, C and D emergency alarm and light system features a red flashing light and 90 db at 10 feet, buzzer that is operated by flow switch. Unit is activated when the emergency shower or eyewash is in operation. System can be mounted to pipe or wall with optional wall bracket that is provided. It is recommended to install unit where a shower or eyewash is in a remote or noisy location where user is unable to summon help. This alarm does not contain multiple sets of contacts for remote activation alarm sites. Light and flow switch are UL Listed and CSA approved. Voltage: 120 VAC, 50 or 60 cycles. Supply: 1-1/4" IPS.