Advanced Gomadic 2 in 1 Auto / Car DC Charger Compatible with Zoom H4n with Foldable Wall AC Charging plug &ndash; Amazing design built with TipExchange Technology Intelligent circuit tailors precise output voltage (including resistor configuration) specific to the Zoom H4n. This ensures battery is safely and efficiently charged. Broad input voltage range of 12-24VDC and 100-240VAC respectively. Permits charging via vehicle and home outlets worldwide! State of the art, advanced circuitry prevents the Zoom H4n from being damaged by power surges, overcharging and/or short-circuiting. When used in vehicle charging mode, high quality capacitors and circuit components ensure that charging current will not interfere with FM radio reception. Backed by Gomadic Lifetime Warranty. This is a quality product that is built to last forever!