Specifications:
1) Dimensions: 31 x 25 x 13mm
2) Voltage: 5V
3) Width pulse: >40ms
4) Frequency: >4Hz
5) Long life: 15 years
6) Ratio:
a) All black wheel: 1:1
b) First wheel is red digit: 10:1
c) First and second wheel is red digit: 100:1
7) Digit numbers as per your need

Packing: carton