Gomadic Intelligent Compact AC Home Wall Charger suitable for the Cygolite Metro 420 / 500 - High output power with a convenient, foldable plug design - Uses TipExchange Technology 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 Cygolite Metro 420 / 500 (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 Cygolite Metro 420 / 500). Advanced state-of-the-art internal circuitry protects the Cygolite Metro 420 / 500 from power surges, overcharging, and short-circuiting, to significantly extend the internal battery lifecycle. TipExchange Technology protects your investment, by providing a means to change/upgrade your charger by simply swapping the physical charging tip. (Charging tip for Cygolite Metro 420 / 500) included with additional tips sold separately) A quality product intended to be the last home/travel charger you ever buy! This product is backed by the Gomadic Lifetime Warranty.