Module Highlights: 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. A key emergency stop function (STOP button), with reverse protection, reverse does not burn. Material:ABS colour:As Shown Package Contents: 2 x Battery Charger Control Switch Only the above package content, other products are not included. Note: Light reflection 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.