Schumacher SP3 3 Amp Automatic Battery Extender / Maintainer The product is 3A Auto Battery Charger Easy to use The product is manufactured in China For use with 6 and 12 Volts batteries Scrolling digital messaging displays step by step instructions to properly charge your battery Auto voltage detection automatically detects 6 or 12 Volts batteries Hook attachment allows the unit to hang outside the work area for safety and convenience It includes 50 ampere quick connect clamps, 24 inch fused ring leads harness with weather cap, 12 Volts DC adapter and manual