Quick shock Two-button operation Biphasic energy output Three-step defibrillation process Extensive voice and visual prompts for the operator Energy Sequence: 150J,150J,200J.(Adult) Non-rechargeable Lithium Battery: 12V, 2.8Ah Charging times: 250 discharges at 200J or 320 discharges at 150J. Automatic Self-test function, with Daily battery condition test & Monthly AED whole internal system test.