and high quality Made of high quality material, more durable. Low noise, reliable use DC 5V 4-phase + for driver test module board A, B, C, D four-phase indicate the working state of the with standard interface for direct insertion Rated voltage: DC5V 4 phase Step angle: 5.625 x 1/64 No load absorption frequency: 600Hz No-load extraction frequency: 1000Hz Pulling torque: 34.3mN.m (120Hz) stop torque: 34.3MN.m DC resistance: 200Ohm7% (25C) Insulation resistance: 10Mohm (500V) Dielectric strength: 600V AC / 1mA / 1s Edge rating: A Temperature rise: Less than 40K (120Hz) Noise: Less than 40dB (120Hz, no load, 10cm) Colour:As shown Material:Plastic + Metal Package Contents: 5 x 28BYJ-48 5 x ULN2003 motor driver board(Due to different batches, the appearance may be different, but the function is the same) 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.