No, it is not recommended to use only one power cable with two electrodes and leave the other two inactive. The Beurer EM 49 device is designed to operate with two channels, each of which can be used with two electrodes. Using only one cable with two electrodes may not fully exploit the functionality of the device and may also affect the safety and effectiveness of the treatment.

The device is equipped with two channels, allowing two pairs of electrodes to be used simultaneously, offering greater flexibility and better coverage of body areas.