Progressive Dynamics Inc.'s 2,000 watt, 12V inverter (no cord), with built-in transfer switch, changes DC output from your RV batteries into AC power and sends it to the electrical system. Pure Sine wave technology, it creates clean power with minimal interference, making it safe, efficient, and perfect for sensitive electronics. The inverter can generate 4,000 starting watts and 2,000 running watts. Great fit for appliances and electronics. The integrated transfer switch will automatically change from inverter to shore power when available (and visa versa).