MA MB MC connecting motor 5V GND Power Supply VCC GND external DC power supply line SC signal output Z/F Connect line 5V or GND to reverse switch VR speed signal input Features: Adopt the SMT process, the quality is stable and reliable. With reverse switch. Control your machine conveniently. Equipped with cooling fan and featured with good heat dissipation. Easy to use. Control the switch when power on. Save your time greatly. Wide Voltage High Power. Specification: Working voltage: 5-36V Maximum current: 16A Maximum power: 350W Over current protection: YES Size: length 63mm x width 45mm x height 27mm Material: Aluminium Alloy Item size: 6.2 * 4.3 * 2.6cm / 2.44 * 1.69 * 1.02in(L * W * H) Item weight: Approx. 89g / 3.14oz Package size: 14.6 * 10.2 * 3cm / 5.75 * 4.02 * 1.18in(L * W * H) Package weight: 91g / 3.21oz Package List: 1 * Brushless Controller Set Note: the package without user manual.