PMMN4148A PMMN4148 - Motorola RM110 Remote Speaker Microphone, with 3.5mm Audio Jack (IP55) The RM110 is a compact and durable windporting remote speaker microphone. Its 3.5mm jack allows connectivity with compatible audio earpieces and has a good level of protection against dust & water (IP55 rated - RSM head only). The RM110, small wired RSM features a compact deisgn and is equipped with a sturdy low profile swivel clip. It has a loud and clear 101 phon speaker to ensure clear audio transmissions and has a 3.5mm audio jack. This RSM is IP55 rated.