The TLM 170R is a large diaphragm, studio condenser microphone with 5 polar patterns selected either by a rotary switch on the rear side of the microphone, or remotely by the N 48 R-2 dual phantom power supply / controller, (optional). "TLM" stands for Trans-formerless Microphone. The "R" denotes remote control capability. Remote control of microphone polar patterns had previously been achieved only through the use of special, multi-conductor cables and connectors. The TLM 170R is the first microphone to achieve this feat via standard, two conductor shielded microphone cable and 3-pin XLR type connectors.