Tecno elettrica ravasi (t.e.r.), prsl1864bi transparent 1/1+2/2 maintained position selector switch, use w/ mike & victor pendants this selector switch is compatible with mike and victor control stations. The selector pointer is made of a translucent plastic for backlighting when an led contact is installed in conjunction. The most common configuration utilizes two prsl 1800 pi switches the most common configuration utilizes two prsl 1800 pi switches and an led contact.