Standard Horizon SSM-21A Speaker Mic f/HX890, HX400, HX400IS, HX380, HX40 HX210 [SSM-21A] Cartography | Garmin Navionics+ This heavy-duty isolator allows multiple

This heavy-duty isolator allows multiple batteries to charge automatically from one or two alternators and prevents the discharge or ‘dumping” of one battery into another

Perfect for detailers

Glass filled polycarbonate base

Style: Pinline (a simple outline with a powerful look)

No wires or connections to make

Standard Horizon SSM-21A Speaker Mic f/HX890, HX400, HX400IS, HX380, HX40 HX210 [SSM-21A] Cartography | Garmin Navionics+ This heavy-duty isolator allows multipleSSM 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