Gomadic High Output Home Wall AC Charger designed for the Garmin nuvi 3597 LMTHD with Power Sleep technology - Intelligently designed with Gomadic TipExchange Advanced state-of-the-art internal circuitry protects the Garmin nuvi 3597 LMTHD from power surges, overcharging, and short-circuiting, to significantly extend the internal battery lifecycle. Power Sleep"" feature reduces vampire power draw 99%. Charger will consume less than 0.1W of power when in ""dormant state"" (e.g. not connected to the Garmin nuvi 3597 LMTHD). Gomadic Powerful High Wattage wall charger for home or travel use. Customized circuit design is based on the latest in power regulation and is tailored to the precise output voltage and resistor ID requirements of the Garmin nuvi 3597 LMTHD (accurate to 0.1v!) Charger works on power voltage levels worldwide by supporting a wide input range of 100-240v AC / 50-60 Hz. Specification: Input Voltage (100 - 240vAC), Cable length (50 inches), Transformer Dimensions (2.0 X 1.75 inches), Foldable Adapter (Yes), Circuit Design (Garmin nuvi 3597 LMTHD Specific)