Feature: 1. Easy to use, when the DC power supply terminal has power, the power supply is preferred, and the battery power supply is automatically switched when the DC power supply terminal has no power. 2. Has the function of automatically switching battery power supply after power failure, suitable for DC 12V, 24V, 36V, 48V. 3. Made of high quality materials, this module is sturdy, durable, not easy to wear, and has a long service life. 4. Using sophisticated production technology, this module has stable performance and can work for a long time. 5. This battery controller module has a 1.6mm thick double layer circuit board with a load of 10A, which can be used for emergency. Specification: Item Type: Battery Controller Module Material: Copper Clad Laminate Model: YX X804 Working Voltage: DC 12V to 48V Load: 10A Product Size: Approx. 50 x 30 x 18mm / 2.0 x 1.2 x 0.7in Installed Size: Approx. 23mm / 1.0in (2 Holes 3MM). Package List: 1 x Battery Controller Module Note: Input, battery, and load must have the same voltage