The Icom HM-159LA is a full size durable speaker microphone for radios, including the IC-F1000 series, IC-F1000D series, IC-F1100 series and IC-F29SR/DR series.The HM-159LA has an integrated 3.5mm jack socket to plug in a listen-only earpiece. It is fitted with a GRS 2-pin plug with screws. The HM-159LA can be used with many Icom two-way radios that have a 2-pin GRS connection.