The Federal Signal PS1000 is a battery and back-up power supply designed for standby use during power outages, providing a nominal 12V DC or 24V DC output selectable by switch. This model supports two 12 amp-hour sealed lead-acid, gelled electrolyte batteries connected in series and delivers 10 amperes of current, with UL Listing for safety. Its steel enclosure is intended for indoor mounting on walls or substantial vertical surfaces and includes a key lock for security. The power supply sub-assembly incorporates solid-state circuitry that maintains battery charge while supplying DC operating voltage, supporting its use as a primary power source for various devices and systems.