Illuminating AED Panoramic SignUtilizes Advanced Photoluminescent Technology. Will illuminate for hours during blackout conditions. Visible from any angle and in total darkness. Sign Dimensions: 8. 25 in. x 8. 25 in. per side. Unlimited cycles of charge and discharge. No batteries required to test or replace Highly durable rigid PVC plastic sign No electricity required 10 year warranty Sign dimensions: 8. 25 in. x 8. 25 in. per side Unlimited cycles of charge and discharge Visible