 As the electronic exposure meter needed more power, a larger battery, of type PX-27 with 5.6 volts, was placed where the former instrument movement was mounted, The electronic circuit was built into the former battery compartment.Unlike the Rollei 35 LED the
shutter position and aperture control settings were transferred, without any electrical contact wear and tear, using a differential gear turning a variable density filter in front of the CdS light sensor.The release button activated the light meter, when slightly depressed.