This battery charging controller Module, features automatic charging, automatic power off. This module maximum limit is 30A. Small size, current, accurate turn-off voltage stability, protection and thoughtful, functional and reliable performance. Thick circuit board for long-lasting performance. With this automatic charging Module, make you relieved, and save energy at same time. Preventing the battery from under voltage and start charging, preventing the battery charging over voltage and stop charging. Specification: Name: Charge Control Module Model: -1708 Battery Type: 12V Voltage Deviation: 0.1V Load: 30A Colour: Blue Material: plastic Size: 7 x 5.1cm Package Contents: 1 x Charge Control Module Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.