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Quick view sku: M3-GRSM-HD1 * Motorola GP328 PLUS Motorola GP328 PLUS Medium Duty Remote Speaker Mic Impact Radio Accessories HD1 Series Remote Speaker Mic With 3.5mm Accessory Jack. Fits Motorola GP328 PLUS Radios.Features: Heavy duty anchored Kevlar reinforced cable Water resistant 3.5mm accessory jack Hardwired adapter to fit Motorola GP328 PLUS... MSRP: Now: $78.10 Choose Options Compare Compare Selected