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 2557 / 2577 / 2597 LMT (accurate to 0.1v!) * 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 2557 / 2577 / 2597 LMT). * Advanced state-of-the-art internal circuitry protects the Garmin nuvi 2557 / 2577 / 2597 LMT from power surges, overcharging, and short-circuiting, to significantly extend the internal battery lifecycle. * Charger works on power voltage levels worldwide by supporting a wide input range of 100-240v AC / 50-60 Hz. * Uniquely engineered in a small, lightweight, and highly portable design, the Gomadic Garmin nuvi 2557 / 2577 / 2597 LMT Wall Charger travels easily, saving both space and time.