Datasheet: https://www.czh-labs.com/tmp/madeimg/datasheet/f-1081.pdf

Features:
1, Reversing relay module. Powers any reversing motor equipment, can be used for any application that requires the ability to reverse motion. 
2, Support Momentary-action(Self-resetting) switch and Alternate-action (Self-holding) switch. For Self-resetting switch, when the switch is pressed the motor operates, and when the switch is released the motor stops.
3, Support external connect forward and reverse limit switch function. If you don't need the limit switch function, just short-circuit it.
4, Compact plastic case and wires connect for easy mount.
5, Forward and Reverse status indicating LED, forward status lighting red, reverse lighting green. When the control switch is not turned on, the module does not consume electric energy.
6, Operating Voltage: 4 - 6.5V DC, Rated current 10 Amp.