Gomadic Intelligent Compact AC Home Wall Charger suitable for the Microsoft Zune HD - 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 Microsoft Zune HD). 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 Microsoft Zune HD (accurate to 0.1v!) Advanced state-of-the-art internal circuitry protects the Microsoft Zune HD 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. Foldable wall outlet plug makes for a very compact, portable design. Advancements in power circuit miniaturization now gives you an amazingly powerful charger for its size.