This Electronic Travel Charger is compatible with the following Samsung models : SGH-t539 / Beat t539. SGH-t639 / t639. SGH-t729 / Blast t729. SGH-t739 / Katalyst t739. SPH-m520 / m520. Specifications : Input : AC 100V-240V, 200mA, 47-63Hz. Output : DC 4.5V-9.5V, Max 800mA. Rapid charge phone battery. IC chip inside prevents overcharging and short circuit. Can be connected with desktop charging stands. Small, lightweight. LED charging indicator. Talk and charge at the same time. Convenient for travelling purpose. Best replacement for the original Charger.