Bosch LM1-VC12P? Wall Volume Control, 12 watts with Relay, portrait orientation. 5 attenuation steps of -3dB plus an off position. Robust metal design. 24V DC Relay (when used) allows attenuator to be bypassed in case of an emergency. 114 x 70 x 32mm (HxWxD)
Public address systems are often used for both announcements and background music distribution. Volume controls can be used to adjust the sound level locally. In the event of an (emergency) announcement, the built in relay ensures that the message is broadcast at a preset level, independent of the local volume setting.
The volume controls are available in 12 watt and 36 watt and 100 watt.
The Bosch LM1-VC12P 12 watt volume control features 5 attenuation steps of -3 dB and an off position. The intuitive graphics around the knob clearly shows the attenuator steps and off position.