1, Reversing relay module. Powers any 2 wires reversing DC motor equipment, can be used for any application that requires the ability to reverse motion. 
2, With Forward and Reverse buttons (momentary type, release button action to stop). Compact plastic case and screw terminal block connect for easy mount.
3, Support external connect Momentary-action(Self-resetting) switch or 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.
4, With power indicator LED. With forward and reverse status indicating LED, forward status lighting red, reverse lighting green.
5, Rated current 10 Amp, Voltage DC 5V 12V 24V version selectable. .

Datasheet: https://www.czh-labs.com/tmp/madeimg/datasheet/HD044.pdf