Opening lid automatically turns FirstSave on and readies it for use Clear, concise voice prompts guide user through rescue process RescueReady® feature performs daily, weekly, and monthly self-tests of the battery, electrodes and circuitry Powered by a five-year warranted lithium battery, providing maintenance-free operation Customized defibrillation with escalating variable energy and STARTM Biphasic or STAR Monophasic waveforms