1. Plastic Support 2.Velocity ratio 100:1,200:1,400:1,800:1,10000:1 3. Type: antimagnetic 4.Big Print Wheels Electrical pulse counter1. Digit wheel diameter: 19.2mm2. Digit size: 3.0 x 5.2 mm3. Working voltage range2.2V~7.5V4. Driving pulse width80ms5. Motor Resistance450Ω±30Ω Electronic Counter