Overheating Protection, Overvoltage Protection, Stall Protection Supports Analog Signal Input Real-time Monitoring of Motor and Drive Temperatures When plugging in , be sure to orient the connector correctly to avoid reversing the polarity and damaging . When using high voltage ( 24V) or high current ( 1.2A), active cooling must be used to prevent from overheating. Supports High Subdivision: 256 microsteps Supports Voltage: 4.5-36V DC Supports Maximum Current: IRMS=2.1A IFS=3A Supports Sensorless Homing Low on-resistance: Rdson (H+L) = 230mΩ Communication Modes: SPI or UART (SPI by default) note: Due to different batches, the appearance, color and printed words of the product , which not affect the use. With heat sink Material: PCB+Metal colour: Black Package Contents: 1 x TMC2240 Stepper Motor Driver 1 x heat sink 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.