1.5A 6/12V DOE Battery Maintainer. Fully Automatic 6V/12V 3 Amp Battery Charger/Maintainer keeps stored lead-acid batteries charged. Charges and maintains small batteries. Scrolling Digital Messaging - the easy to ready, animated display provides step-by-step instructions to properly charge your battery. Hook attachment - hand outside the work area for safety and convenience. Microprocessor Controlled Multi-stage charging for added precision, safety and convenience. Features auto-voltage detection for added precision, safety and battery life.