1. Power Supply Voltage:6.5V-27V(please don' reverse connect or over 27V,or it will damage the modulewe recommend that serial connect with 15A fuse on power input port) 2. Double channel motor interface,each channel rated output current 7A; current 50A (motor interface shouldn' be short circuit connection; we recommend that serial connect with 10A fuse) 3. Control signal voltage 3-6.5V,respectively enable signal and positivenegative rotate control signal 4. Enable signal port () input PWM speed can be adjustable;PWM frequency range 0-10KHz;PWM minimum pulse width 10us 5. Operating Temperature:-25~80 celsius Specification:55 x 55 x 16mm Installation Hole Diameter 3mm color: red Material: PC+Metal Package Contents: 1 x DC Motor Driver Module Only the above package content, other products are not included. Note: Light 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.