Feature:1. [Automatic Design] This battery charging control board is fully automatic and automatically charged and powered off, intelligent, efficient and safe.2. [Adjustable Control] Both the battery start charging voltage and the disconnect charging voltage can be adjusted on the control board.3. [Multi Function Use] In addition to being used as a charging and discharging module, it can also be used as a multimeter function.4. [Use Application] The battery charging control board is suitable for charging batteries and batteries in all voltage ranges.5. [Wide Application] With a wide range of application, controller module can be used in household chargers, solar energy, wind turbines, etc.Specification:Item Type: Battery Charging ModuleMaterial: PlasticProduct Model: HCW-M631Input Voltage: DC 6-40VVoltage Error: 0.1VScope of Application: 6-40V Various BatteriesOutput Type: Relay OutputProduct Size: Approx. 66 x 46 x 16mm / 2.6 x 1.8 x 0.6inHole Size: Approx. 3.3mm / 0.13in.Package List:1 xBattery Charging Module