The PcE-Trainer is a 2 Channel Potential und Biofeedback Instrument Dimensions of the PcE-Trainer: - Height: 8,5 cm (3.3 in)
- Width: 22,5 cm (8.9 in)
- Depth: 20 cm (7.9 in)
Weight incl. Batteries w/o Cable: On the frontpanel of the unit you find: 
Ansicht von vorne - 2 LCD Displays. The left display shows the measurement for the blue wires, the right display for the red wires of the cable.Die linke Messanzeige zeigt die Werte für das blau markierte Messkabel.
- and in the middle is the 5-pin connector for different cables.
On the backpanel you find: 
Ansicht von hinten - 2 compartments for one 9Volt battery each
- and the on/off switch. In order to turn on the unit you move the switch towards the "I" position and in order to turn off the unit you move the switch towards the "O" position. Do not forget to turn off the unit after use in order to preserve battery life.
In order to replace exhausted batteries, use fresh 9 volt batteries like the ones you received originally. Always exchange both batteries::  Turn the unit off ("O" position) - Open each battery compartment by pushing hard, then lift and then pull out
- put the new battery into each compartment so it fits snugly
- now gently push back the compartment until it clicks
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Next: Functionality