The HM 162 Command Mic III from Icom allows you to have the convenience of a second station for your IC-M504. All functions including channel operation, DSC, foghorn, and distress calling are at your fingertips with the Command Mic III. The HM162 is small, yet boasts a large full dot-matrix display screen making the data easy to see. The Command Mic III is rugged as well. Rated at IPX8 submersible, it can stay submerged in 1.5m depth for up to 30 minutes. 2-1/2"W x 5-7/8"H x 1-1/2"D. Three-year warranty.