Power Sentry PSSD2 Series Self-Diagnostics Module for Battery Pack Power Sentry PSSD2 Series Self-Diagnostics Module for Battery Pack The Power Sentry PSSD2 Series Self-Diagnostics Module simplifies emergency lighting operations by providing continuous monitoring of battery pack performance. Featuring a multichromatic status indicator and an optional audible beep, it displays the status of charging, test activation, and diagnostic conditions. The module performs self-diagnostic tests monthly, semi-annually, and annually, evaluating AC to DC transfer, charging, and battery condition. It also includes a patented test switch for manual 30-second diagnostic testing and allows users to postpone automatic testing for up to 8 hours. Ideal for enhancing reliability and ease of maintenance in emergency lighting systems. About Us Welcome to Help! Resale, your go-to consignment shop where value meets quality. At Help! Resale, we're dedicated to providing you with an exceptional shopping experience, whether you're looking to find the best deals or consign your gently used items. Help Resale 7200 Fair Oaks Blvd Ste 120 Carmichael CA 95608 Business Hours: Monday-Friday: 9:00 am to 5:30 pm (PST) All product and company names are trademarks TM or registered trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them. (description exceeds maximum possible length)