Separate Color Filter Lens Inside the Outer Lens Helps to Provide a Clear Signal Modular LED steady/flashing signal tower lights Added a separate color filter lens inside the outer lens to help provide a clear signal Can select from size selections of �50mm, �60mm and �70mm to fit your sophisticated application needs The addition of modules and change in color arrangement can be achieved without the use of tools by using the Lock-type structure QTCA type offers a nifty integrated lens and cover for a simple aesthetically pleasing product When it is turned off the milky color filter provides comfortable viewing at close proximity for the operator A variety of mounting bracket selections for the pole mount type to fit your location and mounting needs Built-in buzzer available : Volume of Max 85dB at 1m Available in customized 2 sound buzzer type and high volume(105dB) buzzer type Can be used with NPN open collector transistor driven input, which allows direct connection to a PLC Flashing rate : 60-80 flashes/min Materials : Lens-PC, Filter lens : PC, Housing-ABS, Pole-Al Ambient operating temperature : -30°C to +50°C Protection rating : Standard type-IP65, Built-in buzzer type-IP54 Certificates : CE Compliant, UL Listed Compliant with RoHS directive