Garmin Nuvi Hardwire Cable (Mini-USB connector) for Garmin Nuvi
Don't waste your money.  I bought this to direct wire my Nuvi 255W to my Honda VTX motorcycle.  It never worked, even when I tried to direct wire it to the battery.  I also bought the waterproof case which is great.  This is my first bad experience on Amazon.  However, I usually order books and cd's not cheap electronic accessories marked \\"Made in China\\".