Due to a caraccident a few years ago I've to treat myself with Tens, a neurostimulator for pain relief. Three days a week I've to control manually sequences, 30 minutes P2 (program 2) and 1 hour P1 (program 1). The problem is due to TBI, I've got now idea about the time nor changing te program. This led to the idea of building a timertool with a buzzer and the timeschedule (sequences). The Arduino requires 50 mA, so I run it with an external adaptor, the 9 Volt battery is tought as a backup in case I want to change floor/room.