Standard Horizon SSM-21A Speaker Mic f/HX890, HX400, HX400IS, HX380, HX40 HX210 [SSM-21A] Marine Hardware | Shaft Seals You can also use this

You can also use this hefty little block to combine the ground wires of two (2) sources to a single grounding point

It also includes anti-glare screen protectors

Running Lights

AIS standards: IEC 62287-2 Ed

Exclusive insulation is rated at 600V

Standard Horizon SSM-21A Speaker Mic f/HX890, HX400, HX400IS, HX380, HX40 HX210 [SSM-21A] Marine Hardware | Shaft Seals You can also use thisSSM 21A Speaker Mic for HX890, HX400, HX400IS, HX380, HX40 & HX210 Standard Horizon SSM 21A submersible speaker microphone with heavy duty belt clip. Compatible with Standard Horizon HX890, HX400, HX400IS, HX380, HX40, and HX210. Specifications: Type: Microphones Box Dimensions: 3"H x 5"W x 7"L WT: 0. 45 lbs UPC: 788026174768