Please read description carefully.
Do not base your order on the picture presented.
Features of the Mettler TENS 210 Unit:
1. Pulse width decreases linearly over a period of 0.5 seconds from the control setting value to a value which is 60% less than the set value.
2. The narrower pulse width is maintained for 2 seconds and then increased linearly over a 0.5 second period to its original value.
3. The pulse width is then maintained for 3.5 seconds at the control setting.