Battery charge and discharge module integrated voltmeter undervoltage and overvoltage for protection timing charge and discharge with communication function Features: 1. Battery charge and discharge intelligent control 2. You can set the charge and discharge time 3. With serial communication function, real-time monitoring of the working status of the relay through the serial port 4. Additional signal output, when the relay to meet the conditions, the output high, you can control other equipment 5. A for key emergency stop function (STOP button), with reverse for protection, reverse does not burn Specifications: 1: Power supply voltage: for DC 6--40V, voltage detection range for DC 0--60V, suitable for less than 60V of the various batteries, voltage measurement error 0.1V 2: charge and discharge for time (OP) range: 0 - 999 minutes Size: 5.9x3cm/2.32x1.18inch Quantity: 1 Pc Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Contents: 1 Pc x Battery Charge Discharge Module