1. 
ON / OFF button and emergency stop
2. 
Programme selection button
3. Channel A power buttons :
+: increase power (level 0 to 72).
- + : decrease power (level 72 to 0).
4. Channel B power buttons:
+ : power increase (level 0 to 72).
- + : decrease power (level from 72 to 0).
5. Channel A power level indicator
6. Programme indicator
7. Channel B power level indicator
8. Connection module
9. Module (or channel) colour indicator
10. Battery compartment
11. Sockets for connecting the 2 modules (USB)
12. Electrode connectors
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