Motorola PMLN7131 MOTOTRBO Hand Held Controller Microphone for DM4000The Motorola PMLN7131 MOTOTRBO Handheld Controller Microphone offers complete installation flexibility for your DM4000 Series radios. Whether mounted behind the seat, under the dash, in the trunk, or even under a desk, the radio unit can be positioned wherever it's most convenient. The handheld controller, featuring a full keypad, colour display, and channel and volume controls, provides full access to your radio's functions from any location within