Features:
1, This is a simple and practical automatic forward reverse relay module, cooperate with two external normally open limit switches to realize cyclically reciprocating motion of DC reversing motor. (This product does not come with limit switches, you must select the appropriate limit switch according to your application requirements.)
2, Operating voltage: 9 to 18VDC (12V version), 18 to 36VDC (24V version). Maximum motor load current 8 Amp. 
3, The product has a power-off memory function, the next time it is turned on, the motor will move along the state of the last power-off.
4, Compact plastic case and terminal block connects for easy mount. Two screw mounting holes are convenient for you to fix it on the wall or wooden board. Of course, you can also choose not to lock the screw. .

Datasheet: https://www.czh-labs.com/tmp/madeimg/datasheet/f-1062.pdf