Gomadic Intelligent Compact AC Home Wall Charger suitable for the Garmin Forerunner 305 - High output power with a convenient, foldable plug design - Uses TipExchange Technology 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 Forerunner 305). Advanced state-of-the-art internal circuitry protects the Garmin Forerunner 305 from power surges, overcharging, and short-circuiting, to significantly extend the internal battery lifecycle. 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 Forerunner 305 (accurate to 0.1v!) Uniquely engineered in a small, lightweight, and highly portable design, the Gomadic Garmin Forerunner 305 Wall Charger travels easily, saving both space and time. Specification: Input Voltage (100 - 240vAC), Cable length (50 inches), Transformer Dimensions (2.0 X 1.75 inches), Foldable Adapter (Yes), Circuit Design (Garmin Forerunner 305 Specific)