The battery tender junior is a 12 or 6 volt, .75 amp trickle charger. It has a fully automatic two stage charging process that is perfect for all lead acid, maintenance free and gel cell batteries. After the battery reaches its peak voltage of 14.4, the charger automatically switches to 13.2 volts. When voltage drops below12.6, the charger resumes charging back to 14.4 volts. As long as the water level is maintained in lead acid type batteries, this trickle charger can be connected to the battery all winter. A two color LED indicates the charging status at a glance and two types of quick disconnect connectors are included. A 12 foot output cord and instructions are included. Measures 3 5/16 x 2 5/16 x 1 1/8 inches. Manufactured by Deltron.