G-ED-S1 Driver Board Suitable for driving outputs like DC motor, stepper motor, lamp, buzzer etc... | G-ED-S2 Servo Driver Board Suitable for lamp, buzzer, dc motor, stepper motor, lamp, buzzer & servo motors (up to 2 servo outputs) | G-ED-R1 Relay Board Suitable for switching forward- reverse dc source, turning ON-OFF a load such as motor, lamp, pump etc... | G-ED-L1 Double 7-Segment Display Board 2 Digit display - Suitable to use as a Stopwatch & Duration Counter. |